Fair Value Measurement of Assets and Liabilities - Assets and Liabilities Measured at Fair Value on Recurring and Non-Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	$ 1,452,489	$ 1,506,861
Unpaid principal balances of loans held for sale	14,800	16,100
Covered real estate owned	2,400	5,000
U.S. Treasury securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	411,335	549,473
U.S. government agency securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	26,922	29,963
Obligations of states and political subdivisions
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	126,222	124,966
Residential mortgage-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	782,648	696,428
Trust preferred securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	8,259	8,404
Corporate and other debt securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	78,208	77,552
Equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	18,895	20,075
Non-Recurring Fair Value Measurements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Covered real estate owned	270	4,200
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring Fair Value Measurements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	429,686	568,381
Loans held for sale	0	0
Other assets	0	0
Total assets	429,686	568,381
Other liabilities	0	0
Total liabilities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring Fair Value Measurements \| U.S. Treasury securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	411,335	549,473
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring Fair Value Measurements \| U.S. government agency securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring Fair Value Measurements \| Obligations of states and political subdivisions
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring Fair Value Measurements \| Residential mortgage-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring Fair Value Measurements \| Trust preferred securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring Fair Value Measurements \| Corporate and other debt securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	17,887	17,710
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Recurring Fair Value Measurements \| Equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	464	1,198
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Non-Recurring Fair Value Measurements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Collateral dependent impaired loans	0	0
Loan servicing rights	0	0
Foreclosed assets	0	0
Total	0	0
Significant Other Observable Inputs (Level 2) \| Recurring Fair Value Measurements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	1,009,854	924,687
Loans held for sale	15,347	16,382
Other assets	49,308	33,774
Total assets	1,074,509	974,843
Other liabilities	70,199	50,844
Total liabilities	70,199	50,844
Significant Other Observable Inputs (Level 2) \| Recurring Fair Value Measurements \| U.S. Treasury securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	0	0
Significant Other Observable Inputs (Level 2) \| Recurring Fair Value Measurements \| U.S. government agency securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	26,922	29,963
Significant Other Observable Inputs (Level 2) \| Recurring Fair Value Measurements \| Obligations of states and political subdivisions
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	126,222	124,966
Significant Other Observable Inputs (Level 2) \| Recurring Fair Value Measurements \| Residential mortgage-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	771,801	684,777
Significant Other Observable Inputs (Level 2) \| Recurring Fair Value Measurements \| Trust preferred securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	6,157	6,262
Significant Other Observable Inputs (Level 2) \| Recurring Fair Value Measurements \| Corporate and other debt securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	60,321	59,842
Significant Other Observable Inputs (Level 2) \| Recurring Fair Value Measurements \| Equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	18,431	18,877
Significant Other Observable Inputs (Level 2) \| Non-Recurring Fair Value Measurements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Collateral dependent impaired loans	0	0
Loan servicing rights	0	0
Foreclosed assets	0	0
Total	0	0
Significant Unobservable Inputs (Level 3) \| Recurring Fair Value Measurements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	12,949	13,793
Loans held for sale	0	0
Other assets	0	0
Total assets	12,949	13,793
Other liabilities	0	0
Total liabilities	0	0
Significant Unobservable Inputs (Level 3) \| Recurring Fair Value Measurements \| U.S. Treasury securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	0	0
Significant Unobservable Inputs (Level 3) \| Recurring Fair Value Measurements \| U.S. government agency securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	0	0
Significant Unobservable Inputs (Level 3) \| Recurring Fair Value Measurements \| Obligations of states and political subdivisions
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	0	0
Significant Unobservable Inputs (Level 3) \| Recurring Fair Value Measurements \| Residential mortgage-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	10,847	11,651
Significant Unobservable Inputs (Level 3) \| Recurring Fair Value Measurements \| Trust preferred securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	2,102	2,142
Significant Unobservable Inputs (Level 3) \| Recurring Fair Value Measurements \| Corporate and other debt securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	0	0
Significant Unobservable Inputs (Level 3) \| Recurring Fair Value Measurements \| Equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	0	0
Significant Unobservable Inputs (Level 3) \| Non-Recurring Fair Value Measurements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Collateral dependent impaired loans	6,209	15,427
Loan servicing rights	4,142	2,571
Foreclosed assets	2,604	16,672
Total	12,955	34,670
Fair Value \| Recurring Fair Value Measurements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	1,452,489	1,506,861
Loans held for sale	15,347	16,382
Other assets	49,308	33,774
Total assets	1,517,144	1,557,017
Other liabilities	70,199	50,844
Total liabilities	70,199	50,844
Fair Value \| Recurring Fair Value Measurements \| U.S. Treasury securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	411,335	549,473
Fair Value \| Recurring Fair Value Measurements \| U.S. government agency securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	26,922	29,963
Fair Value \| Recurring Fair Value Measurements \| Obligations of states and political subdivisions
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	126,222	124,966
Fair Value \| Recurring Fair Value Measurements \| Residential mortgage-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	782,648	696,428
Fair Value \| Recurring Fair Value Measurements \| Trust preferred securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	8,259	8,404
Fair Value \| Recurring Fair Value Measurements \| Corporate and other debt securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	78,208	77,552
Fair Value \| Recurring Fair Value Measurements \| Equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	18,895	20,075
Fair Value \| Non-Recurring Fair Value Measurements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Collateral dependent impaired loans	6,209	15,427
Loan servicing rights	4,142	2,571
Foreclosed assets	2,604	16,672
Total	$ 12,955	$ 34,670

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Fair value of asset after deduction of liability.

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Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts.

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Fair value of financial and nonfinancial obligations.

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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Carrying amount of other real estate covered by loss sharing agreements not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations that may also be included in real estate owned. Excludes real estate assets taken in settlement of troubled loans through surrender or foreclosure by banks.

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This is the principal amount outstanding for loans which are in the process of being securitized as of the date of the statement of financial position (across all types of loans).

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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Fair value of the collateral dependent impaired loans.

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