Fair Value Measurement of Assets and Liabilities - Assets and Liabilities Measured at Fair Value on Recurring and Non-Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	$ 807,574	$ 886,970
Trading securities	0	14,233
U.S. Treasury securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	49,273	49,443
U.S. government agency securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	26,529	33,825
Obligations of states and political subdivisions
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	43,410	44,051
Residential mortgage-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	585,791	644,276
Trust preferred securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	8,618	20,537
Corporate and other debt securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	73,484	74,012
Equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	20,469	20,826
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	68,574	69,021
Trading securities		0
Loans held for sale	0	0
Other assets	0	0
Total assets	68,574	69,021
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	49,273	49,443
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	17,963	18,241
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	1,338	1,337
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]
Non-performing loans held for sale		0
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	724,288	798,640
Trading securities		14,233
Loans held for sale	4,533	17,165
Other assets	23,982	20,987
Total assets	752,803	851,025
Other liabilities	41,801	33,330
Total liabilities	41,801	33,330
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	26,529	33,825
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	43,410	44,051
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	573,202	629,696
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	6,495	15,808
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	55,521	55,771
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	19,131	19,489
Significant Other Observable Inputs (Level 2) \| Non-Recurring Fair Value Measurements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Non-performing loans held for sale		0
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	14,712	19,309
Trading securities		0
Loans held for sale	0	0
Other assets	0	0
Total assets	14,712	19,309
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	12,589	14,580
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	2,123	4,729
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]
Non-performing loans held for sale		7,130
Collateral dependent impaired loans	9,642	13,985
Loan servicing rights	3,023	3,987
Foreclosed assets	6,429	18,098
Total	19,094	43,200
Fair Value \| Recurring Fair Value Measurements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	807,574	886,970
Trading securities		14,233
Loans held for sale	4,533	17,165
Other assets	23,982	20,987
Total assets	836,089	939,355
Other liabilities	41,801	33,330
Total liabilities	41,801	33,330
Fair Value \| Recurring Fair Value Measurements \| U.S. Treasury securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	49,273	49,443
Fair Value \| Recurring Fair Value Measurements \| U.S. government agency securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	26,529	33,825
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	43,410	44,051
Fair Value \| Recurring Fair Value Measurements \| Residential mortgage-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	585,791	644,276
Fair Value \| Recurring Fair Value Measurements \| Trust preferred securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	8,618	20,537
Fair Value \| Recurring Fair Value Measurements \| Corporate and other debt securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	73,484	74,012
Fair Value \| Recurring Fair Value Measurements \| Equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	20,469	20,826
Fair Value \| Non-Recurring Fair Value Measurements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Non-performing loans held for sale		7,130
Collateral dependent impaired loans	9,642	13,985
Loan servicing rights	3,023	3,987
Foreclosed assets	6,429	18,098
Total	$ 19,094	$ 43,200

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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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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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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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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Fair value of the collateral dependent impaired loans.

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Non Performing Loans Held-For-Sale, Fair Value Disclosure

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