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Fair Value Measurement - Estimates Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Financial Assets
Cash and due from banks	$ 244,333	$ 169,186
Equity securities	11,644	11,737
Available-for-sale debt securities	2,209,199	2,114,129
Held-to-maturity debt securities	852,824	1,020,934
Net loans	7,702,435	7,607,333
Loans held for sale	20,715	8,994
Accrued interest receivable	37,156	38,853
Financial Liabilities
Deposits	8,664,363	8,831,633
Federal Home Loan Bank borrowings	1,161,092	1,054,174
Other borrowings	325,247	290,522
Subordinated debt and junior subordinated debt	156,632	189,842
Accrued interest payable	5,273	4,627
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial Assets
Cash and due from banks	244,333	169,186
Equity securities	11,644	11,737
Accrued interest receivable	37,156	38,853
Financial Liabilities
Deposits	7,388,830	7,376,023
Other borrowings	322,295	288,918
Accrued interest payable	5,273	4,627
Significant Other Observable Inputs (Level 2) [Member]
Financial Assets
Available-for-sale debt securities	2,207,565	2,112,626
Held-to-maturity debt securities	877,258	120,195
Loans held for sale	20,715	8,994
Other assets - interest rate derivatives	18,672	4,650
Financial Liabilities
Deposits	1,282,416	1,460,367
Federal Home Loan Bank borrowings	1,167,912	1,051,401
Other borrowings	3,368	1,936
Subordinated debt and junior subordinated debt	144,998	174,448
Other liabilities - interest rate derivatives	20,721	5,081
Significant Unobservable Inputs (Level 3) [Member]
Financial Assets
Available-for-sale debt securities	1,634	1,503
Held-to-maturity debt securities	551	548
Net loans	7,741,859	7,422,825
Carrying Amount [Member]
Financial Assets
Cash and due from banks	244,333	169,186
Equity securities	11,644	11,737
Available-for-sale debt securities	2,209,199	2,114,129
Held-to-maturity debt securities	852,824	1,020,934
Net loans	7,702,435	7,607,333
Loans held for sale	20,715	8,994
Other assets - interest rate derivatives	18,672	4,650
Accrued interest receivable	37,156	38,853
Financial Liabilities
Deposits	8,664,363	8,831,633
Federal Home Loan Bank borrowings	1,161,092	1,054,174
Other borrowings	325,247	290,522
Subordinated debt and junior subordinated debt	156,632	189,842
Other liabilities - interest rate derivatives	20,721	5,081
Accrued interest payable	5,273	4,627
Fair Value Estimate [Member]
Financial Assets
Cash and due from banks	244,333	169,186
Equity securities	11,644	11,737
Available-for-sale debt securities	2,209,199	2,114,129
Held-to-maturity debt securities	877,809	120,743
Net loans	7,741,859	7,422,825
Loans held for sale	20,715	8,994
Other assets - interest rate derivatives	18,672	4,650
Accrued interest receivable	37,156	38,853
Financial Liabilities
Deposits	8,671,246	8,836,390
Federal Home Loan Bank borrowings	1,167,912	1,051,401
Other borrowings	325,663	290,854
Subordinated debt and junior subordinated debt	144,998	174,448
Other liabilities - interest rate derivatives	20,721	5,081
Accrued interest payable	$ 5,273	$ 4,627

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Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of investment in debt security measured at amortized cost (held-to-maturity).

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