Fair Value Measurement of Assets and Liabilities - Assets and Liabilities Measured at Fair Value on Recurring and Non-Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	$ 797,389	$ 886,970
Trading securities	0	14,233
U.S. Treasury securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	50,468	49,443
U.S. government agency securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	25,513	33,825
Obligations of states and political subdivisions
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	43,469	44,051
Residential mortgage-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	569,650	644,276
Trust preferred securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	8,593	20,537
Corporate and other debt securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	79,017	74,012
Equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	20,679	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	69,836	69,021
Trading securities		0
Loans held for sale	0	0
Other assets	0	0
Total assets	69,836	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	50,468	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	17,903	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	1,465	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	713,207	798,640
Trading securities		14,233
Loans held for sale	18,184	17,165
Other assets	34,114	20,987
Total assets	765,505	851,025
Other liabilities	57,344	33,330
Total liabilities	57,344	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	25,513	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	43,469	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	557,486	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	6,411	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	61,114	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	19,214	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	14,346	19,309
Trading securities		0
Loans held for sale	0	0
Other assets	0	0
Total assets	14,346	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	12,164	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	2,182	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	9,173	13,985
Loan servicing rights	2,922	3,987
Foreclosed assets	10,058	18,098
Total	22,153	43,200
Fair Value \| Recurring Fair Value Measurements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	797,389	886,970
Trading securities		14,233
Loans held for sale	18,184	17,165
Other assets	34,114	20,987
Total assets	849,687	939,355
Other liabilities	57,344	33,330
Total liabilities	57,344	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	50,468	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	25,513	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	43,469	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	569,650	644,276
Fair Value \| Recurring Fair Value Measurements \| Trust preferred securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	8,593	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	79,017	74,012
Fair Value \| Recurring Fair Value Measurements \| Equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	20,679	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	9,173	13,985
Loan servicing rights	2,922	3,987
Foreclosed assets	10,058	18,098
Total	$ 22,153	$ 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 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 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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