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, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	$ 1,276,709	$ 1,506,861
Loans held for sale	27,868	16,832
Unpaid principal balances of loans held for sale	27,000	16,100
Covered real estate owned	1,000	5,000
U.S. Treasury securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	51,791	549,473
U.S. government agency securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	24,097	29,963
Obligations of states and political subdivisions
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	125,290	124,966
Residential mortgage-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	966,638	696,428
Trust preferred securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	8,156	8,404
Corporate and other debt securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	80,567	77,552
Equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	20,170	20,075
Non-Recurring Fair Value Measurements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Covered real estate owned	200	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	69,906	568,381
Loans held for sale	0	0
Other assets	0	0
Total assets	69,906	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	51,791	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	17,579	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	536	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	1,194,406	924,687
Loans held for sale	27,868	16,382
Other assets	46,019	33,774
Total assets	1,268,293	974,843
Other liabilities	72,672	50,844
Total liabilities	72,672	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	24,097	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	125,290	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	956,266	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	6,131	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	62,988	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	19,634	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	12,397	13,793
Loans held for sale	0	0
Other assets	0	0
Total assets	12,397	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	10,372	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	2,025	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	2,214	15,427
Loan servicing rights	7,358	2,571
Foreclosed assets	1,711	16,672
Total	11,283	34,670
Fair Value \| Recurring Fair Value Measurements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	1,276,709	1,506,861
Loans held for sale	27,868	16,382
Other assets	46,019	33,774
Total assets	1,350,596	1,557,017
Other liabilities	72,672	50,844
Total liabilities	72,672	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	51,791	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	24,097	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	125,290	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	966,638	696,428
Fair Value \| Recurring Fair Value Measurements \| Trust preferred securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	8,156	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	80,567	77,552
Fair Value \| Recurring Fair Value Measurements \| Equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale	20,170	20,075
Fair Value \| Non-Recurring Fair Value Measurements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Collateral dependent impaired loans	2,214	15,427
Loan servicing rights	7,358	2,571
Foreclosed assets	1,711	16,672
Total	$ 11,283	$ 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 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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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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