Receivables [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Activity in Allowance for Loan Losses
Schedule of Credit Losses Related to Financing Receivables, Current and Noncurrent [Table Text Block]
Allowance for Credit Losses on Financing Receivables
Allowance for Credit Losses on Financing Receivables [Table Text Block]
Past Due Financing Receivables
Past Due Financing Receivables [Table Text Block]
Impaired Financing Receivables
Impaired Financing Receivables [Table Text Block]
Troubled Debt Restructurings
Troubled Debt Restructurings on Financing Receivables [Table Text Block]
Financing Receivable Credit Quality Indicators
Financing Receivable Credit Quality Indicators [Table Text Block]
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Fair Value Measurements, Nonrecurring
Fair Value Measurements, Nonrecurring [Table Text Block]
Fair Value, by Balance Sheet Grouping
Fair Value, by Balance Sheet Grouping [Table Text Block]
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Schedule of Share-based Compensation, Stock Options, Activity
Share-based Compensation, Stock Options, Activity [Table Text Block]
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
Share-Based Compensation
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Subsidiary or Equity Method Investee [Table]
Schedule of Subsidiary or Equity Method Investee [Table]
Class of Financing Receivable, Type [Axis]
Class of Financing Receivable, Type [Axis]
Class of Financing Receivable, Type [Domain]
Class of Financing Receivable, Type [Domain]
1-4 Family Residential
Real Estate One-To-Four Family Residential [Member]
Real Estate One-To-Four Family Residential [Member]
Adjustments for New Accounting Pronouncements [Axis]
Adjustments for New Accounting Pronouncements [Axis]
Type of Adoption [Domain]
Type of Adoption [Domain]
ASU 2018-02
Accounting Standards Update 2018-02 [Member]
Accounting Standards Update 2018-02 [Member]
ASU 2016-01
Accounting Standards Update 2016-01 [Member]
Equity Components [Axis]
Equity Components [Axis]
Equity Component [Domain]
Equity Component [Domain]
Retained earnings
Retained Earnings [Member]
Subsidiary or Equity Method Investee [Line Items]
Subsidiary or Equity Method Investee [Line Items]
Origination covenants, maximum loan-to-value ratio (greater than) (percent)
Financing Receivable, Origination Covenants, Maximum Loan-to-Value Ratio
Financing Receivable, Origination Covenants, Maximum Loan-to-Value Ratio
Cumulative effect on change in accounting principle
Cumulative Effect of New Accounting Principle in Period of Adoption
Investments, Debt and Equity Securities [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Gross Unrealized Losses - Less than twelve months
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss
Gross Unrealized Losses - More than twelve months
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Fair Value - Less than twelve months
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value
Fair Value - More than twelve months
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value
Schedule of Impaired Financing Receivable [Table]
Schedule of Impaired Financing Receivable [Table]
Financing Receivable Portfolio Segment [Axis]
Financing Receivable Portfolio Segment [Axis]
Financing Receivable Portfolio Segment [Domain]
Financing Receivable Portfolio Segment [Domain]
Consumer, Excluding Consumer Other Portfolio Segment
Consumer, Excluding Consumer Other Portfolio Segment [Member]
Consumer, Excluding Consumer Other Portfolio Segment [Member]
Consumer
Consumer Other Portfolio Segment [Member]
Consumer Other Portfolio Segment [Member]
Commercial business
Commercial Portfolio Segment [Member]
Home Equity
Home Equity Line of Credit [Member]
Commercial Real Estate
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment
Impaired Financing Receivable, Average Recorded Investment
Interest Income Recognized
Impaired Financing Receivable, Interest Income, Accrual Method
Schedule of Financing Receivable, Allowance for Credit Losses [Table]
Schedule of Financing Receivable, Allowance for Credit Losses [Table]
Consumer and Commercial Portfolio Segment
Consumer and Commercial Portfolio Segment [Member]
Consumer and Commercial Portfolio Segment [Member]
Construction
Construction Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Loans and Leases Receivable, Beginning Allowance
Loans and Leases Receivable, Allowance
Provision (credit) for loan losses
Provision for Loan, Lease, and Other Losses
Loans charged-off
Financing Receivable, Allowance for Credit Losses, Write-downs
Recoveries
Financing Receivable, Allowance for Credit Losses, Recovery
Loans and Leases Receivable, Ending Allowance
Schedule of Held-to-maturity Securities [Table]
Schedule of Held-to-maturity Securities [Table]
Major Types of Debt and Equity Securities [Axis]
Major Types of Debt and Equity Securities [Axis]
Major Types of Debt and Equity Securities [Domain]
Major Types of Debt and Equity Securities [Domain]
Government-sponsored mortgage-backed and collateralized mortgage obligations
US Government-sponsored Mortgage-backed Securities and Collateralized Mortgage Obligations [Member]
US Government-sponsored Mortgage-backed Securities and Collateralized Mortgage Obligations [Member]
SBA asset-backed securities
Small Business Administration Asset-backed Securities [Member]
Small Business Administration Asset-backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Schedule of Held-to-maturity Securities [Line Items]
Debt securities:
Held-to-maturity Securities [Abstract]
Amortized Cost
Held-to-maturity Securities
Gross Unrealized Gains
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain
Gross Unrealized Losses
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss
Fair Value
Held-to-maturity Securities, Fair Value
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]
After 1 year through 5 years, Held to Maturity, Amortized Cost
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount
After 5 years through 10 years, Held to Maturity, Amortized Cost
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount
Single Maturity Date, Held to Maturity, Amortized Cost
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis
Mortgage- and asset-backed securities and collateralized mortgage obligations - Amortized Basis
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value [Abstract]
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value [Abstract]
After 1 year through 5 years, Held to Maturity, Fair Value
Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Fair Value
After 5 years through 10 years, Held to Maturity, Fair Value
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value
Single Maturity Date, Held to Maturity, Fair Value
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value
Mortgage- and asset-backed securities and collateralized mortgage obligations - Fair Value
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value
Held-to-maturity securities, total debt securities
Loans and The Allowance for Loan Losses
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Award Type [Axis]
Award Type [Axis]
Equity Award [Domain]
Equity Award [Domain]
Stock Options
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance (shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number
Granted (shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross
Forfeited (shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period
Exercised (shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period
Ending balance (shares)
Exercisable at end of period (shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Beginning balance, weighted average exercise price (dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price
Granted, weighted average exercise price (dollars per share)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price
Forfeited, weighted average exercise price (dollars per share)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price
Exercised, weighted average exercise price (dollars per share)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price
Ending balance, weighted average exercise price (dollars per share)
Exercisable at end of period, weighted average exercise price (dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price
Outstanding, weighted average remaining contractual term (years)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term
Exercisable at period end, weighted average remaining contractual term (years)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Exercised, aggregate intrinsic value
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value
Outstanding, aggregate intrinsic value
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value
Exercisable, aggregate intrinsic value
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value
Unrecognized compensation cost
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options
Weighted average remaining recognition period (years)
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition
Statement of Stockholders' Equity [Abstract]
Statement [Table]
Statement [Table]
Common Stock
Common Stock [Member]
Additional paid-in capital
Additional Paid-in Capital [Member]
Unearned compensation- ESOP
Deferred Compensation, Share-based Payments [Member]
Accumulated other comprehensive (loss) income
AOCI Attributable to Parent [Member]
Statement [Line Items]
Statement [Line Items]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance
Stockholders' Equity Attributable to Parent
Beginning balance (shares)
Shares, Outstanding
Cumulative effect of change in accounting principle ASU 2016-01 (Note 2)
Comprehensive income
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
ESOP shares committed to be released
Amortization of ESOP Award
Common stock dividends declared ($0.08 and $0.45 per common share for the nine months ended September 30, 2016 and 2017, respectively)
Dividends, Common Stock
Restricted stock awards granted (shares)
Stock Issued During Period, Shares, Restricted Stock Award, Gross
Restricted stock awards granted
Stock Issued During Period, Value, Restricted Stock Award, Gross
Restricted stock awards forfeited (shares)
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited
Restricted stock awards forfeited
Stock Issued During Period, Value, Restricted Stock Award, Forfeitures
Share-based compensation expense
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition
Share redemption for tax withholdings for restricted stock vesting (shares)
Shares Paid for Tax Withholding for Share Based Compensation
Share redemption for tax withholdings for restricted stock vesting
Adjustments Related to Tax Withholding for Share-based Compensation
Proceeds from exercise of options (shares)
Proceeds from exercise of options
Stock Issued During Period, Value, Stock Options Exercised
Ending balance
Ending balance (shares)
Retirement Benefits [Abstract]
Employee Stock Ownership Plan
Compensation and Employee Benefit Plans [Text Block]
Statement of Comprehensive Income [Abstract]
Net income
Net Income (Loss) Attributable to Parent
Other comprehensive income:
Other Comprehensive Income (Loss), before Tax [Abstract]
Securities available for sale:
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [Abstract]
Change in unrealized holding gains
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax
Reclassification adjustment for net losses realized in net income
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax
Net change in unrealized gains
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax
Tax effect
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax
Net-of-tax amount
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax
Securities held to maturity:
Other Comprehensive Income (Loss), Held-to-maturity Securities Adjustment, Net of Tax [Abstract]
Other Comprehensive Income (Loss), Held-to-maturity Securities Adjustment, Net of Tax [Abstract]
Reclassification adjustment for amortization of amounts previously recorded upon transfer from available-for-sale
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Held-to-maturity Securities, before Tax
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Held-to-maturity Securities, before Tax
Tax effect
Other Comprehensive Income (Loss), Held-to-maturity Securities, Tax
Other Comprehensive Income (Loss), Held-to-maturity Securities, Tax
Net-of-tax amount
Other Comprehensive Income (Loss), Held-to-maturity Securities Adjustment, Net of Tax
Other Comprehensive Income (Loss), Held-to-maturity Securities Adjustment, Net of Tax
Defined benefit pension plan:
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [Abstract]
Reclassification adjustment for net actuarial loss recognized in net periodic benefit cost
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax
Tax effect
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax
Net-of-tax amount
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
Other comprehensive income
Other Comprehensive Income (Loss), Net of Tax
Comprehensive income
Total mortgage- and other asset-backed securities
Other Mortgage-backed and Asset-backed Securities [Member]
Other Mortgage-backed and Asset-backed Securities [Member]
Municipal bonds
Municipal Bonds [Member]
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Gross Unrealized Losses - Less than twelve months
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss
Gross Unrealized Losses - More than twelve months
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Fair Value - Less than twelve months
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value
Fair Value - More than twelve months
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value
Securities
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Interest Rate Derivatives
Schedule of Derivative Instruments [Table Text Block]
Summary of Fair Value and Location of Mortgage Loan and Forward Loan Sale Commitments
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location [Table Text Block]
Recorded Investment
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded Investment, without valuation allowance
Impaired Financing Receivable, with No Related Allowance, Recorded Investment
Recorded Investment, with a valuation allowance
Impaired Financing Receivable, with Related Allowance, Recorded Investment
Recorded Investment, total
Impaired Financing Receivable, Recorded Investment
Unpaid Principal Balance
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid Principal Balance, without a valuation allowance
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance
Unpaid Principal Balance, with a valuation allowance
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance
Unpaid Principal Balance, total
Impaired Financing Receivable, Unpaid Principal Balance
Related Allowance
Impaired Financing Receivable, Related Allowance
Available-for-sale Securities
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
Held-to-maturity Securities
Schedule of Held-to-maturity Securities Reconciliation [Table Text Block]
Schedule of Held-to-maturity Securities Reconciliation [Table Text Block]
Investments Classified by Contractual Maturity Date
Investments Classified by Contractual Maturity Date [Table Text Block]
Unrealized Gain (Loss) and Fair Value of Investments - Available-for-sale Securities
Available-for-sale Securities [Table Text Block]
Unrealized Gain (Loss) and Fair Value of Investments - Held-to-maturity Securities
Held-to-maturity Securities [Table Text Block]
Schedule of Financing Receivables Past Due [Table]
Schedule of Financing Receivables Past Due [Table]
Financing Receivables, Period Past Due [Axis]
Financing Receivables, Period Past Due [Axis]
Financing Receivables, Period Past Due [Domain]
Financing Receivables, Period Past Due [Domain]
30-59 Days Past Due
Financing Receivables, 30 to 59 Days Past Due [Member]
60-89 Days Past Due
Financing Receivables, 60 to 89 Days Past Due [Member]
Past Due 90 Days or More
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due
Financing Receivable, Recorded Investment, Past Due
Loans on Non-accrual
Financing Receivable, Recorded Investment, Nonaccrual Status
Allocated
Employee Stock Ownership Plan (ESOP), Number of Allocated Shares
Committed to be allocated
Employee Stock Ownership Plan (ESOP), Number of Committed-to-be-Released Shares
Unallocated
Employee Stock Ownership Plan (ESOP), Number of Suspense Shares
Total
Employee Stock Ownership Plan (ESOP), Shares in ESOP
Statement of Financial Position [Abstract]
Assets
Assets [Abstract]
Cash and due from banks
Cash and Due from Banks
Short-term investments
Short-term Investments
Total cash and cash equivalents
Cash, Cash Equivalents, and Short-term Investments
Equity securities, at fair value
Equity Securities, FV-NI
Equity Securities, FV-NI
Securities available for sale, at fair value
Available-for-sale Securities
Securities held to maturity, at amortized cost
Federal Home Loan Bank stock, at cost
Federal Home Loan Bank Stock
Loans held for sale
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group
Loans, net of allowance for loan losses of $20,185 at March 31, 2018 and $20,877 at December 31, 2017
Financing Receivable, Net
Premises and equipment, net
Property, Plant and Equipment, Net
Other real estate owned
Repossessed Assets
Accrued interest receivable
Interest Receivable
Goodwill
Goodwill
Core deposit intangible
Finite-Lived Intangible Assets, Net
Net deferred tax asset
Deferred Tax Assets, Net
Bank-owned life insurance
Bank Owned Life Insurance
Other assets
Other Assets
Total assets
Assets
Liabilities and Stockholders' Equity
Liabilities and Equity [Abstract]
Deposits:
Deposits [Abstract]
Non-interest bearing
Noninterest-bearing Deposit Liabilities
Interest bearing
Interest-bearing Deposit Liabilities
Total deposits
Deposits
Short-term borrowings
Short-term Debt
Long-term debt
Long-term Debt
Accrued expenses and other liabilities
Accrued Liabilities and Other Liabilities
Total liabilities
Liabilities
Stockholders' Equity:
Equity [Abstract]
Preferred stock, zero par value, (50,000,000 shares authorized; none issued and outstanding)
Preferred Stock, Value, Issued
Common stock, $0.01 par value, (100,000,000 shares authorized; 26,861,521 and 26,827,660 issued and outstanding at March 31, 2018 and December 31, 2017, respectively)
Common Stock, Value, Outstanding
Additional paid-in capital
Additional Paid in Capital
Unearned compensation-ESOP
Unearned ESOP Shares
Retained earnings
Retained Earnings (Accumulated Deficit)
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss), Net of Tax
Total stockholders' equity
Total liabilities and stockholders' equity
Liabilities and Equity
Banking and Thrift [Abstract]
Schedule of Deposit Balances
Schedule of Deposit Balances [Table Text Block]
Schedule of Deposit Balances [Table Text Block]
Schedule of Contractual Maturities of Deposits and Weighted Average Rate
Schedule of Contractual Maturities of Deposits and Weighted Average Rate [Table Text Block]
Schedule of Contractual Maturities of Deposits and Weighted Average Rate [Table Text Block]
Deposits
Deposit Liabilities Disclosures [Text Block]
Fair Value Measurements, Recurring and Nonrecurring [Table]
Fair Value Measurements, Recurring and Nonrecurring [Table]
Derivative Instrument [Axis]
Derivative Instrument [Axis]
Derivative Contract [Domain]
Derivative Contract [Domain]
Interest rate swap agreements
Interest Rate Swap [Member]
Forward loan sale commitments-best efforts
Forward Loan Sale Commitment - Best Efforts [Member]
Forward Loan Sale Commitment - Best Efforts [Member]
Forward loan sale commitments mandatory delivery
Forward Loan Sale Commitments - Mandatory Delivery [Member]
Forward Loan Sale Commitments - Mandatory Delivery [Member]
Forward loan sale commitments-best efforts
Forward Loan Sale Commitment [Member]
Forward Loan Sale Commitment [Member]
Mortgage loan commitments best efforts
Mortgage Loan Commitments - Best Efforts [Member]
Mortgage Loan Commitments - Best Efforts [Member]
Mortgage loan commitments mandatory delivery
Mortgage Loan Commitments - Mandatory Delivery [Member]
Mortgage Loan Commitments - Mandatory Delivery [Member]
Measurement Frequency [Axis]
Measurement Frequency [Axis]
Fair Value, Measurement Frequency [Domain]
Fair Value, Measurement Frequency [Domain]
Recurring
Fair Value, Measurements, Recurring [Member]
Fair Value, Hierarchy [Axis]
Fair Value, Hierarchy [Axis]
Fair Value Hierarchy [Domain]
Fair Value Hierarchy [Domain]
Level 1
Fair Value, Inputs, Level 1 [Member]
Level 2
Fair Value, Inputs, Level 2 [Member]
Level 3
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities at fair value
Marketable equity securities
Available-for-sale Securities, Equity Securities
Interest rate swap agreements
Derivative Asset
Total assets
Assets, Fair Value Disclosure
Liabilities
Liabilities [Abstract]
Interest rate swap agreements
Derivative Liability
Nonrecurring
Fair Value, Measurements, Nonrecurring [Member]
Impaired loans
Impaired Financing Receivable, Fair Value Disclosure
Impaired Financing Receivable, Fair Value Disclosure
Impaired loans
Impaired Financing Receivable, Gain (Loss) Recognized in Earnings
Impaired Financing Receivable, Gain (Loss) Recognized in Earnings
Accumulated Other Comprehensive Income (Loss) [Table]
Accumulated Other Comprehensive Income (Loss) [Table]
Debt Security [Axis]
Debt Security [Axis]
Major Types of Debt Securities [Domain]
Major Types of Debt Securities [Domain]
Securities Available for Sale
Available-for-sale Securities [Member]
Securities Held to Maturity
Held-to-maturity Securities [Member]
Accumulated Net Investment Gain (Loss)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Defined Benefit Pension Plan
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrealized actuarial gain (loss)
AOCI Including Portion Attributable to Noncontrolling Interest, before Tax
Tax effect
Accumulated Other Comprehensive Income (Loss), Tax
Accumulated Other Comprehensive Income (Loss), Tax
Accumulated other comprehensive income
Schedule of Financing Receivable, Troubled Debt Restructurings [Table]
Schedule of Financing Receivable, Troubled Debt Restructurings [Table]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications [Line Items]
Number of contracts
Financing Receivable, Modifications, Number of Contracts
Pre-Modification Outstanding Recorded Investment
Financing Receivable, Modifications, Pre-Modification Recorded Investment
Post-Modification Outstanding Recorded Investment
Financing Receivable, Modifications, Post-Modification Recorded Investment
Marketable equity securities
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]
Amortized Cost
Available-for-sale Equity Securities, Amortized Cost Basis
Gross Unrealized Gains
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax
Gross Unrealized Losses
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax
Fair Value
Stockholders' Equity
Stockholders' Equity Note Disclosure [Text Block]
Derivatives
Derivative Instruments and Hedging Activities Disclosure [Text Block]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans
Loans and Leases Receivable, before Fees, Gross
Allowance for loan losses
Discount and fair value adjustments on purchased loans
Financing Receivable, Discount on Purchased Loans
Financing Receivable, Discount on Purchased Loans
Deferred loan costs and fees, net
Financing Receivable, Deferred Loan Costs and Fees, Net
Financing Receivable, Deferred Loan Costs and Fees, Net
Loans, net
Loans and Leases Receivable, Net Amount
ESOP, Number of shares committed to be released annually (shares)
Employee Stock Ownership Plan (ESOP), Number of Annual Committed-to-be-Released Shares
Employee Stock Ownership Plan (ESOP), Number of Annual Committed-to-be-Released Shares
Fair Value of unallocated shares
Employee Stock Ownership Plan ESOP Number of Suspense Shares Fair Value
Represents the fair value of shares contributed to the ESOP that have not yet been released, committed to be released, or allocated to participant accounts. Suspense shares generally collateralize ESOP debt.
ESOP expense
Employee Stock Ownership Plan (ESOP), Compensation Expense
Mortgage and asset-backed securities and collateralized mortgage obligations, weighted average duration
Held-to-maturity Securities, Debt Maturities, Weighted Average Term
Held-to-maturity Securities, Debt Maturities, Weighted Average Term
Net unrealized gains on equity securities
Equity Securities, FV-NI, Unrealized Gain
Equity Securities, FV-NI, Unrealized Gain
Proceeds from sale of available-for-sale securities
Proceeds from Sale of Available-for-sale Securities
Available-for-sale securities, gross realized gains
Available-for-sale Securities, Gross Realized Gains
Available-for-sale securities, gross realized losses
Available-for-sale Securities, Gross Realized Losses
Held-to-maturity securities, depreciation, percentage of amortized cost basis
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Depreciation, Percentage of Amortized Cost Basis
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Depreciation, Percentage of Amortized Cost Basis
Accounting Changes and Error Corrections [Abstract]
Future lease commitments
Operating Leases, Future Minimum Payments Due
Statement of Cash Flows [Abstract]
Residential Portfolio
Home Equity Portfolio
Cash flows from operating activities:
Net Cash Provided by (Used in) Operating Activities [Abstract]
Adjustments to reconcile net income to net cash provided by operating activities:
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Provision (credit) for loan losses
Provision for Loan and Lease Losses
Net amortization of securities
Accretion (Amortization) of Discounts and Premiums, Investments
Loss on sales and calls of available for sale securities, net
Available-for-sale Securities, Gross Realized Gain (Loss)
Net unrealized losses on equity securities
Equity Securities, FV-NI, Unrealized Gain (Loss)
Equity Securities, FV-NI, Unrealized Gain (Loss)
Net change in loans held for sale
Increase (Decrease) in Loans Held-for-sale
Net amortization of net deferred loan origination costs and discounts
Amortization of Deferred Loan Origination Fees, Net
Depreciation and amortization of premises and equipment
Depreciation and Amortization, Excluding Amortization of Intangible Assets
Depreciation and Amortization, Excluding Amortization of Intangible Assets
Amortization of core deposit intangible
Amortization of Intangible Assets
Bank-owned life insurance income, including death benefit gains
Bank Owned Life Insurance Income
Deferred income tax benefit
Deferred Income Tax Expense (Benefit)
Share-based compensation expense
Share-based Compensation
Gain on exchange of investment in Northeast Retirement Services
Gain (Loss) on Conversion of Investments
Gain (Loss) on Conversion of Investments
Gain on sale of premises and equipment
Gain (Loss) on Disposition of Property Plant Equipment
Net change in:
Increase (Decrease) in Operating Capital [Abstract]
Accrued interest receivable
Increase (Decrease) in Accrued Interest Receivable, Net
Other assets
Increase (Decrease) in Other Operating Assets
Accrued expenses and other liabilities
Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities
Net cash provided by operating activities
Net Cash Provided by (Used in) Operating Activities
Cash flows from investing activities:
Net Cash Provided by (Used in) Investing Activities [Abstract]
Activity in securities available for sale:
Activity in Securities Available For Sale [Abstract]
Activity in Securities Available-for-Sale [Abstract]
Purchases
Payments to Acquire Available-for-sale Securities
Sales
Principal paydowns
Proceeds From Principal Paydowns of Available-for-sale Securities
Proceeds From Principal Paydowns of Available-for-sale Securities
Activity in securities held to maturity:
Activity in Securities Held-to-Maturity [Abstract]
Activity in Securities Held-to-Maturity [Abstract]
Purchases
Payments to Acquire Held-to-maturity Securities
Principal paydowns
Proceeds from Prepayments of Held-to-maturity Securities
Proceeds from Prepayments of Held-to-maturity Securities
Loan originations and purchases, net of paydowns
Payments for (Proceeds from) Origination of Loans, Net of Paydowns
Payments for (Proceeds from) Origination of Loans, Net of Paydowns
Net purchases of premises and equipment
Payments to Acquire Property, Plant, and Equipment
Purchase of FHLBB stock
Payments to Acquire Federal Home Loan Bank Stock
Redemption of FHLBB stock
Proceeds from Sale of Federal Home Loan Bank Stock
Proceeds from exchange of investment in Northeast Retirement Services
Proceeds from the Conversion of Investments
Proceeds from the Conversion of Investments
Net cash provided by (used in) investing activities
Net Cash Provided by (Used in) Investing Activities
Cash flows from financing activities:
Net Cash Provided by (Used in) Financing Activities [Abstract]
Net change in deposits, excluding brokered deposits
Increase (Decrease) in Deposits, Excluding Brokered Deposits
Increase (Decrease) in Deposits, Excluding Brokered Deposits
Net change in brokered deposits
Increase (Decrease) in Brokered Deposits
Increase (Decrease) in Brokered Deposits
Net change in short-term borrowings
Proceeds from (Repayments of) Short-term Debt
Share redemption for tax withholdings for restricted stock vesting
Payments Related to Tax Withholding for Share-based Compensation, Restricted Stock
Payments Related to Tax Withholding for Share-based Compensation, Restricted Stock
Proceeds from exercise of stock options
Proceeds from Stock Options Exercised
Common stock dividends paid
Payments of Ordinary Dividends, Common Stock
Net cash provided by (used in) financing activities
Net Cash Provided by (Used in) Financing Activities
Net change in cash and cash equivalents
Cash and Cash Equivalents, Period Increase (Decrease)
Cash and cash equivalents at beginning of period
Cash and Cash Equivalents, at Carrying Value
Cash and cash equivalents at end of period
Supplementary information:
Supplemental Cash Flow Information [Abstract]
Interest paid
Interest Paid
Income taxes paid, net of refunds
Income Taxes Paid, Net
Other real estate owned acquired in settlement of loans
Real Estate Owned, Transfer to Real Estate Owned
Common stock dividends declared
Other real estate owned properties
Repossessed Assets, Quantity
Repossessed Assets, Quantity
Expenses applicable to foreclosed assets
Foreclosed Real Estate Expense
Allowance related to impaired loans
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment
Allowance related to non-impaired loans
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment
Total allowance for loan losses
Impaired loans
Financing Receivable, Individually Evaluated for Impairment
Non-impaired loans
Financing Receivable, Collectively Evaluated for Impairment
Total loans
Financing Receivable, Gross
Fair Value Measurements
Fair Value Disclosures [Text Block]
Income Statement [Abstract]
Interest and dividend income:
Interest and Dividend Income, Operating [Abstract]
Interest and fees on loans
Interest and Fee Income, Loans and Leases
Interest on securities
Interest Income, Operating
Dividends
Dividend Income, Operating
Other
Other Interest and Dividend Income
Total interest and dividend income
Interest and Dividend Income, Operating
Interest expense:
Interest Expense [Abstract]
Interest on deposits
Interest Expense, Deposits
Interest on borrowings
Interest Expense, Borrowings
Total interest expense
Interest Expense
Net interest and dividend income
Interest Income (Expense), Net
Provision (credit) for loan losses
Net interest and dividend income, after provision (credit) for loan losses
Interest Income (Expense), after Provision for Loan Loss
Non-interest income:
Noninterest Income [Abstract]
Deposit account fees
Fees and Commissions, Deposit Account Fees
Fees and Commissions, Deposit Account Fees
Interchange and ATM fees
Fees and Commissions, Interchange and ATM fees
Fees and Commissions, Interchange and ATM fees
Mortgage banking
Noninterest Income, Mortgage Banking
The noninterest income derived from mortgage banking activities (fees and commissions), including fees earned from servicing third-party assets. In addition, includes the adjustment to the carrying value of the rights retained or purchased to service mortgage as well as gains (losses) from mortgages held-for-sale
Loan level derivative income
Gain (Loss) on Derivative Instruments, Net, Pretax
Net unrealized losses on equity securities
Loss on sales of available for sale securities, net
Gain (Loss) on Sale of Investments
Gain on exchange of investment in Northeast Retirement Services
Bank-owned life insurance income
Bank Owned Life Insurance Income, Excluding Death Benefit Gains
Bank Owned Life Insurance Income, Excluding Death Benefit Gains
Gain on sale of premises and equipment
Bank Owned Life Insurance Income, Death Benefit Gains
Bank Owned Life Insurance Income, Death Benefit Gains
Miscellaneous
Noninterest Income, Other
Total non-interest income
Noninterest Income
Non-interest expense:
Noninterest Expense [Abstract]
Salaries and employee benefits
Labor and Related Expense
Occupancy and equipment
Occupancy, Net
Data processing
Information Technology and Data Processing
Professional fees
Professional Fees
Advertising
Advertising Expense
FDIC deposit insurance
Federal Deposit Insurance Corporation Premium Expense
Directors’ fees
Noninterest Expense Directors Fees
Other general and administrative
Other Noninterest Expense
Total non-interest expense
Noninterest Expense
Provision for income taxes
Income Tax Expense (Benefit)
Net income
Earnings per common share:
Earnings Per Share, Basic and Diluted [Abstract]
Basic (dollars per share)
Earnings Per Share, Basic
Diluted (dollars per share)
Earnings Per Share, Diluted
Weighted average shares outstanding:
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]
Basic (shares)
Weighted Average Number of Shares Outstanding, Basic
Diluted (shares)
Weighted Average Number of Shares Outstanding, Diluted
Document and Entity Information [Abstract]
Document and Entity Information [Abstract]
Entity Registrant Name
Entity Registrant Name
Entity Central Index Key
Entity Central Index Key
Current Fiscal Year End Date
Current Fiscal Year End Date
Entity Filer Category
Entity Filer Category
Document Type
Document Type
Document Period End Date
Document Period End Date
Document Fiscal Year Focus
Document Fiscal Year Focus
Document Fiscal Period Focus
Document Fiscal Period Focus
Amendment Flag
Amendment Flag
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Common stock paid (dollars per share)
Common Stock, Dividends, Per Share, Cash Paid
Other Real Estate Owned
Real Estate Owned [Text Block]
Earnings Per Share [Abstract]
Earnings Per Common Share
Earnings Per Share [Text Block]
Amount
Time Deposits, Fiscal Year Maturity [Abstract]
Amount - Within 1 year
Time Deposit Maturities, Next Rolling Twelve Months
Amount - 1-2 years
Time Deposit Maturities, Rolling Year Two
Amount - 2-3 years
Time Deposit Maturities, Rolling Year Three
Amount - 3-4 years
Time Deposit Maturities, Rolling Year Four
Amount - 4 years and beyond
Time Deposit Maturities, Rolling Year Five
Total term certificate accounts
Time Deposits
Weighted Average Rate
Weighted Average Rate of Time Deposits [Abstract]
Weighted Average Rate - Within 1 year
Time Deposits, Weighted Average Interest Rate, Maturities Year One
Weighted Average Rate - 1-2 years
Time Deposits, Weighted Average Interest Rate, Maturities Year Two
Weighted Average Rate - 2-3 years
Time Deposits, Weighted Average Interest Rate, Maturities Year Three
Weighted Average Rate - 3-4 years
Time Deposits, Weighted Average Interest Rate, Maturities Year Four
Weighted Average Rate - 4 years and beyond
Time Deposits, Weighted Average Interest Rate, Maturities Year Five
Weighted Average Rate
Time Deposits, Weighted Average Interest Rate
Time Deposits, Weighted Average Interest Rate
Unvested Restricted Stock
Unvested Restricted Stock [Member]
Unvested Restricted Stock [Member]
Net income applicable to common stock
Average number of common shares outstanding
Weighted Average Number of Shares Issued, Basic
Less: Average unallocated ESOP shares
Weighted Average Number of Shares, Employee Stock Ownership Plan Shares Not Committed to be Released
Less: Average unvested restricted stock awards
Weighted Average Number of Shares, Restricted Stock
Average number of common shares outstanding used to calculate basic earnings per common share
Effect of dilutive share-based compensation awards (in shares)
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements
Average number of common shares outstanding used to calculate diluted earnings per common share
Earnings per common share:
Earnings Per Share, Basic [Abstract]
Antidilutive securities excluded from computation of earnings per share (shares)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Reclassification adjustment for net losses realized in net income, tax
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax
Fair Value, by Balance Sheet Grouping [Table]
Fair Value, by Balance Sheet Grouping [Table]
Mortgage loan commitments-best efforts
Mortgage Loan Commitments [Member]
Mortgage Loan Commitments [Member]
Forward loan sale commitments best efforts
Measurement Basis [Axis]
Measurement Basis [Axis]
Fair Value Measurement [Domain]
Fair Value Measurement [Domain]
Portion at Fair Value Measurement
Portion at Fair Value Measurement [Member]
Estimate of Fair Value Measurement
Estimate of Fair Value Measurement [Member]
Carrying Amount
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets:
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents
Cash and Cash Equivalents, Fair Value Disclosure
Equity securities at fair value
Securities held to maturity
Federal Home Loan Bank stock
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure
Loans and loans held for sale, net
Loans Receivable, Fair Value Disclosure
Accrued interest receivable
Accrued Interest Receivables, Fair Value Disclosure
Accrued Interest Receivables, Fair Value Disclosure
Financial liabilities:
Liabilities, Fair Value Disclosure [Abstract]
Deposits
Deposits, Fair Value Disclosure
Borrowings
Debt Instrument, Fair Value Disclosure
On-balance sheet derivative financial instruments:
Off Balance Sheet Derivative Financial Instruments [Abstract]
Off Balance Sheet Derivative Financial Instruments [Abstract]
Derivative assets:
Derivative liabilities:
Basis of Presentation and Consolidation
Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block]
Accounting Standards Updates
New Accounting Pronouncements and Changes in Accounting Principles [Text Block]
Restricted Stock
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning balance (shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number
Granted (shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period
Vested (shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period
Forfeited (shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period
Ending balance (shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Beginning balance, weighted average exercise price (dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value
Granted, weighted average exercise price (dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value
Vested, weighted average exercise price (dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value
Forfeited, weighted average exercise price (dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value
Ending balance, weighted average exercise price (dollars per share)
Unrecognized compensation cost inclusive of directors' fees
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options
Comprehensive Income
Comprehensive Income (Loss) Note [Text Block]
Range [Axis]
Range [Axis]
Range [Domain]
Range [Domain]
Minimum
Minimum [Member]
Maximum
Maximum [Member]
Options granted (shares)
Vesting period (years)
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period
Term (years)
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period
Expected volatility (percent)
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate
Expected life (years)
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term
Expected dividend yield (percent)
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate
Risk free interest rate (percent)
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate
Weighted average grant date fair value (dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value
Performance Shares
Performance Shares [Member]
Number of shares authorized
Common Stock, Capital Shares Reserved for Future Issuance
Share-based compensation expense
Allocated Share-based Compensation Expense
Tax benefit related to share-based compensation expense
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense
Vested (shares)
Nonvested (shares)
Forfeited (shares)
Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table]
Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table]
Internal Credit Assessment [Axis]
Internal Credit Assessment [Axis]
Internal Credit Assessment [Domain]
Internal Credit Assessment [Domain]
Loans rated 1 - 6
Pass [Member]
Loans rated 7
Special Mention [Member]
Loans rated 8
Substandard [Member]
Loans rated 9
Doubtful [Member]
Loans rated 10
Unlikely to be Collected Financing Receivable [Member]
Loans not rated
Loans Not Rated [Member]
Loans Not Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Recorded Investment [Line Items]
Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]
Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]
Commercial loan level interest rate swap agreements
Other contracts
Other Contract [Member]
Hedging Designation [Axis]
Hedging Designation [Axis]
Hedging Designation [Domain]
Hedging Designation [Domain]
Not Designated as Hedging Instrument
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivatives, Fair Value [Line Items]
Derivative Gains, notional amount
Derivative Asset, Notional Amount
Derivative Gains, fair value
Derivative Losses, notional amount
Derivative Liability, Notional Amount
Derivative Losses, fair value
Basis of Presentation
Basis of Accounting, Policy [Policy Text Block]
Loan policies
Finance, Loans and Leases Receivable, Policy [Policy Text Block]
Allowance for Loan Losses
Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block]
Recent Accounting Standards Updates
New Accounting Pronouncements, Policy [Policy Text Block]
Tier one capital conservation buffer common equity capital to risk weighted assets (greater than)
Tier One Capital Conservation Buffer Common Equity Capital to Risk Weighted Assets
Tier One Capital Conservation Buffer Common Equity Capital to Risk Weighted Assets
Schedule of Accumulated Other Comprehensive Loss
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]
Derivative [Table]
Derivative [Table]
Balance Sheet Location [Axis]
Balance Sheet Location [Axis]
Balance Sheet Location [Domain]
Balance Sheet Location [Domain]
Other assets
Other Assets [Member]
Other liabilities
Other Liabilities [Member]
Mortgage Banking Derivatives
Mortgage Banking Derivatives [Member]
Mortgage Banking Derivatives [Member]
Total mortgage derivative commitments
Total forward loan sale commitments
Derivative [Line Items]
Derivative [Line Items]
Schedule of Earnings Per Share, Basic and Diluted
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table]
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table]
Legal Entity [Axis]
Legal Entity [Axis]
Entity [Domain]
Entity [Domain]
Blue Hills Bank
Blue Hills Bank [Member]
Blue Hills Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital (to risk weighted assets)
Capital [Abstract]
Actual - Total Capital to Risk Weighted Assets
Capital
Actual - Total Capital to Risk Weighted Assets Ratio (percentage)
Capital to Risk Weighted Assets
Minimum Capital Requirement - Total Capital
Capital Required for Capital Adequacy
Minimum Capital Requirement - Total Capital to Risk Weighted Assets Ratio (percentage)
Capital Required for Capital Adequacy to Risk Weighted Assets
Minimum to Be Well Capitalized - Total Capital
Capital Required to be Well Capitalized
Minimum to Be Well Capitalized - Total Capital to Risk Weighted Assets Ratio (percentage)
Capital Required to be Well Capitalized to Risk Weighted Assets
Tier 1 capital (to risk weighted assets)
Tier One Risk Based Capital [Abstract]
Actual - Tier 1 Capital to Risk Weighted Assets
Tier One Risk Based Capital
Actual - Tier 1 Capital to Risk Weighted Assets Ratio (percentage)
Tier One Risk Based Capital to Risk Weighted Assets
Minimum Capital Requirement - Tier 1 Capital to Risk Weighted Assets
Tier One Risk Based Capital Required for Capital Adequacy
Minimum Capital Requirement - Tier 1 Capital to Risk Weighted Assets Ratio (percentage)
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets
Minimum to Be Well Capitalized - Tier 1 Capital to Risk Weighted Assets
Tier One Risk Based Capital Required to be Well Capitalized
Minimum to Be Well Capitalized - Tier 1 Capital to Risk Weighted Assets Ratio (percentage)
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets
Common equity Tier 1 (to risk weighted assets)
Common Equity Risk Based Capital [Abstract]
Common Equity Risk Based Capital [Abstract]
Actual - Common Equity to Risk Weighted Assets
Common Equity Risked Based Capital
Common Equity Risked Based Capital
Actual - Common Equity to Risk Weighted Assets Ratio (percentage)
Common Equity Risk Based Capital to Risk Weighted Assets
Common Equity Risk Based Capital to Risk Weighted Assets
Minimum Capital Requirement - Common Equity to Risk Weighted Assets
Common Equity Risk Based Capital Required for Capital Adequacy
Common Equity Risk Based Capital Required for Capital Adequacy
Minimum Capital Requirement - Common Equity to Risk Weighted Assets Ratio (percentage)
Common Equity Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets
Common Equity Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets
Minimum to Be Well Capitalized - Common Equity to Risk Weighted Assets
Common Equity Risk Based Capital Required to be Well Capitalized
Common Equity Risk Based Capital Required to be Well Capitalized
Minimum to Be Well Capitalized - Common Equity to Risk Weighted Assets Ratio (percentage)
Common Equity Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets
Common Equity Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets
Tier 1 capital (to average assets)
Tier One Leverage Capital [Abstract]
Actual - Tier 1 Capital to Average Assets
Tier One Leverage Capital
Actual - Tier 1 Capital to Average Assets Ratio (percentage)
Tier One Leverage Capital to Average Assets
Minimum Capital Requirement - Tier 1 Capital to Average Assets
Tier One Leverage Capital Required for Capital Adequacy
Minimum Capital Requirement - Tier 1 Capital to Average Assets Ratio (percentage)
Tier One Leverage Capital Required for Capital Adequacy to Average Assets
Minimum to Be Well Capitalized - Tier 1 Capital to Average Assets
Tier One Leverage Capital Required to be Well Capitalized
Minimum to Be Well Capitalized - Tier 1 Capital to Average Assets Ratio (percentage)
Tier One Leverage Capital Required to be Well Capitalized to Average Assets
NOW and demand
Deposits, Negotiable Order of Withdrawal (NOW) and Demand
Deposits, Negotiable Order of Withdrawal (NOW) and Demand
Regular savings
Deposits, Savings Deposits
Money market
Deposits, Money Market Deposits
Brokered money market
Deposits, Brokered Money Market
Deposits, Brokered Money Market
Total non-certificate accounts
Deposits, Brokered Money Market, Money Market Deposits, Negotiable Order of Withdrawal (NOW), and Savings
Deposits, Brokered Money Market, Money Market Deposits, Negotiable Order of Withdrawal (NOW), and Savings
Term certificates of $250,000 or more
Time Deposits, $250,000 or More, Total
Time Deposits, $250,000 or More, Total
Term certificates less than $250,000
Time Deposits, Less than $250,000
Time Deposits, Less than $250,000
Brokered term certificates
Deposits, Brokered
Deposits, Brokered
Employee Stock Ownership Plan (ESOP) Disclosures
Employee Stock Ownership Plan (ESOP) Disclosures [Table Text Block]
Loans, net of allowance for loan losses of $20,185 at March 31, 2018 and $20,877 at December 31, 2017
Preferred stock, par value (dollars per share)
Preferred Stock, Par or Stated Value Per Share
Preferred stock, shares authorized
Preferred Stock, Shares Authorized
Preferred stock, shares issued
Preferred Stock, Shares Issued
Preferred stock, shares outstanding
Preferred Stock, Shares Outstanding
Common stock, par value (dollars per share)
Common Stock, Par or Stated Value Per Share
Common stock, shares authorized
Common Stock, Shares Authorized
Common stock, shares issued
Common Stock, Shares, Issued
Common stock, shares outstanding
Common Stock, Shares, Outstanding
TBA Securities
TBA Securities [Member]
TBA Securities [Member]
Interest Rate Lock Commitments - Best Efforts
Interest Rate Lock Commitments - Best Efforts [Member]
Interest Rate Lock Commitments - Best Efforts [Member]
Interest Rate Lock Commitments - Loans Held-for-sale - Best Efforts
Interest Rate Lock Commitments - Loans Held-for-sale - Best Efforts [Member]
Interest Rate Lock Commitments - Loans Held-for-sale - Best Efforts [Member]
Interest Rate Lock Commitments - Borrowers - Best Efforts
Interest Rate Lock Commitments - Borrowers - Best Efforts [Member]
Interest Rate Lock Commitments - Borrowers - Best Efforts [Member]
Interest Rate Lock Commitments - Mandatory Delivery
Interest Rate Lock Commitments - Mandatory Delivery [Member]
Interest Rate Lock Commitments - Mandatory Delivery [Member]
Interest Rate Lock Commitments - Borrowers - Mandatory Delivery
Interest Rate Lock Commitments - Borrowers - Mandatory Delivery [Member]
Interest Rate Lock Commitments - Borrowers - Mandatory Delivery [Member]
Interest Rate Lock Commitments - Loans Held-for-sale - Mandatory Delivery
Interest Rate Lock Commitments - Loans Held-for-sale - Mandatory Delivery [Member]
Interest Rate Lock Commitments - Loans Held-for-sale - Mandatory Delivery [Member]
Mortgage Loan Commitments - Borrowers - Best Efforts
Mortgage Loan Commitments - Borrowers - Best Efforts [Member]
Mortgage Loan Commitments - Borrowers - Best Efforts [Member]
Mortgage Loan Commitments - Loans Held-for-sale - Best Efforts
Mortgage Loan Commitments - Loans Held-for-sale - Best Efforts [Member]
Mortgage Loan Commitments - Loans Held-for-sale - Best Efforts [Member]
Settlement term
Derivative, Term of Contract
Notional amount
Derivative, Notional Amount
Closed hedge not settled
Derivative, Closed Hedge Not Settled
Derivative, Closed Hedge Not Settled