CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Cash Flows from Operating Activities
Net income	$ 7,761us-gaap_NetIncomeLoss	$ 7,887us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based and non-cash compensation	341us-gaap_ShareBasedCompensation	224us-gaap_ShareBasedCompensation
Depreciation and amortization	2,163	2,141
Provision for loan losses	500us-gaap_ProvisionForLoanAndLeaseLosses	1,000us-gaap_ProvisionForLoanAndLeaseLosses
Provision for deferred income taxes	119	2,952
Amortization of security premiums and discounts, net	2,165	1,786
Accretion of premiums and discounts on loans, net	(262)
Net security gains	(1)us-gaap_GainLossOnSaleOfSecuritiesNet	(43)us-gaap_GainLossOnSaleOfSecuritiesNet
Gain on sales of loans, net	(1,426)us-gaap_GainLossOnSalesOfLoansNet	(981)us-gaap_GainLossOnSalesOfLoansNet
Net (gain) on disposition of premises and equipment		(2)
Premises and equipment impairment	670us-gaap_AssetImpairmentCharges
Increase in cash surrender value of bank owned life Insurance	(379)us-gaap_BankOwnedLifeInsuranceIncome	(393)us-gaap_BankOwnedLifeInsuranceIncome
Change in assets and liabilities:
Decrease (increase) in other assets	1,672	(292)
Decrease in other liabilities	(5,155)	(5,288)
Decrease in interest payable	(42)	(76)
Decrease in income taxes receivable	926	82
Net cash provided by operating activities before activities for loans originated for sale	9,052	8,997
Loans originated for sale	(73,687)	(42,055)
Proceeds from sales of loans	68,576	49,830
Net cash provided by operating activities	3,941	16,772
Cash Flows from Investing Activities
Proceeds from sales of securities classified available for sale	7,687	59,125
Proceeds from maturities of securities classified available for sale	56,105	54,582
Proceeds from maturities of securities classified held to maturity	4
Purchase of securities classified available for sale	(55,383)	(126,159)
Purchase of securities classified held to maturity		(1,026)
Net decrease in loans	44,285	54,417
Proceeds from disposition of premises and equipment	9	2
Proceeds from sale of other real estate owned ("OREO") properties	425	575	2,739
Purchases of premises and equipment	(1,062)	(596)
Net cash received in acquisitions	12,114us-gaap_CashAcquiredFromAcquisition
Net cash provided by investing activities	64,184	40,920
Cash Flows from Financing Activities
Net decrease in certificates of deposit	(18,642)us-gaap_IncreaseDecreaseInTimeDeposits	(22,871)us-gaap_IncreaseDecreaseInTimeDeposits
Net increase in demand, money market and savings deposits	59,778	80,906
Cash dividends paid	(4,523)us-gaap_PaymentsOfDividends	(3,654)us-gaap_PaymentsOfDividends
Value of shares surrendered upon vesting of restricted stock units to cover tax obligations	(22)	(12)
Net decrease in securities sold under agreements to repurchase	(15,218)	(55,110)
Net cash provided by (used in) financing activities	21,373	(741)
Net increase in cash and due from banks	89,498	56,951
Cash and due from banks, beginning	339,438	231,603	231,603
Cash and due from banks, ending	428,936	288,554	339,438
Cash Payments for:
Interest	1,635us-gaap_InterestPaidNet	1,770us-gaap_InterestPaidNet
Income taxes	3,130us-gaap_IncomeTaxesPaid	1,100us-gaap_IncomeTaxesPaid
Non-cash investing and financing activities:
Other real estate acquired in settlement of loans	$ 192	$ 316	$ 660

Represents amortization of security premiums and discounts.

No definition available.

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Value transferred from commercial and mortgage loans to real estate owned (REO) in noncash transactions.

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No definition available.

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The net cash inflow (outflow) is the total of all demand deposits including checking and negotiable order of withdrawal (NOW) accounts, saving deposits (which may include passbook) and statement savings accounts classified as cash flows from financing activities.

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No definition available.

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This element represents the net cash from (used in) the entity's operating activities before loan originations and sales.

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No definition available.

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The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Earnings on or other increases in the value of the cash surrender value of bank owned life insurance policies.

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The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business).

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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The aggregate net amount of depreciation, amortization, and accretion recognized during an accounting period. As a noncash item, the net amount is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

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The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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The increase (decrease) during the reporting period in the account that represents the temporary difference that results from Income or Loss that is recognized for accounting purposes but not for tax purposes and vice versa.

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The net cash inflow or outflow from the fund lent to other financial institution arising from the excess in reserve deposited at Federal Reserve Bank to meet legal requirement. This borrowing is usually contracted on an overnight basis at an agreed rate of interest. Also include cash inflow or outflow from investment sold under the agreement to reacquire such investment.

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The increase (decrease) during the reporting period in income taxes receivable, which represents the amount due from tax authorities for refunds of overpayments or recoveries of income taxes paid.

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The increase (decrease) during the reporting period in interest payable, which represents the amount owed to note holders, bond holders, and other parties for interest earned on loans or credit extended to the reporting entity.

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The increase (decrease) during the reporting period in other assets used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current assets, other noncurrent assets, or a combination of other current and noncurrent assets.

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The increase (decrease) during the reporting period in other liabilities used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current liabilities, other noncurrent liabilities, or a combination of other current and noncurrent liabilities.

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Net cash inflow (outflow) of time deposits.

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The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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The increase (decrease) in cash associated with the entity's continuing operating, investing, and financing activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.

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No definition available.

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Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The amount of cash paid for the origination of mortgages that are held for sale.

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The net cash outflow or inflow for the increase (decrease) in the beginning and end of period of loan and lease balances which are not originated or purchased specifically for resale. Includes cash payments and proceeds associated with (a) loans held-for-investment, (b) leases held-for-investment, and (c) both.

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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

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Amount of cash outflow through purchase of long-term held-to-maturity securities.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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The cash inflow associated with the maturity, prepayments and calls (requests for early payments) of debt securities designated as held-to-maturity.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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The cash inflow from sales of loans that are secured with real estate mortgages and are held with the intention to resell in the near future.

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The cash inflow associated with the sale of other real estate not otherwise defined in the taxonomy.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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Amount of expense related to estimated loss from loan and lease transactions.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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