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Fair Value Measurement - Estimates Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financial Assets
Cash and due from banks	$ 1,251,358	$ 905,447
Equity securities	13,466	13,047
Available-for-sale debt securities	3,013,462	1,978,136
Held-to-maturity debt securities	1,004,823	731,212
Loans held for sale	25,277	168,378
Accrued interest receivable	60,844	66,790
Financial Liabilities
Deposits	13,565,863	12,429,373
Federal Home Loan Bank borrowings	183,920	549,003
Other borrowings	141,893	241,950
Junior subordinated debt	132,860
Subordinated debt and junior subordinated debt	132,860	192,291
Accrued interest payable	1,901	4,314
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial Assets
Cash and due from banks	1,251,358	905,447
Equity securities	13,466	13,047
Accrued interest receivable	60,844	66,790
Financial Liabilities
Deposits	12,273,211	10,810,863
Other borrowings	134,288	235,796
Accrued interest payable	1,901	4,314
Significant Other Observable Inputs (Level 2) [Member]
Financial Assets
Available-for-sale debt securities	3,011,969	1,976,601
Held-to-maturity debt securities	1,028,047	767,720
Loans held for sale	25,277	168,378
Other assets—interest rate derivatives	24,867	46,418
Financial Liabilities
Deposits	1,302,266	1,629,118
Federal Home Loan Bank borrowings	185,684	555,375
Junior subordinated debt	109,186
Subordinated debt and junior subordinated debt		105,768
Other liabilities—interest rate derivatives	26,388	49,917
Significant Unobservable Inputs (Level 3) [Member]
Financial Assets
Available-for-sale debt securities	1,493	1,535
Held-to-maturity debt securities	405	463
Net loans	9,385,917	10,802,883
Financial Liabilities
Subordinated debt and junior subordinated debt		68,684
Carrying Amount [Member]
Financial Assets
Cash and due from banks	1,251,358	905,447
Equity securities	13,466	13,047
Available-for-sale debt securities	3,013,462	1,978,136
Held-to-maturity debt securities	1,004,555	730,886
Net loans	9,611,856	10,603,406
Loans held for sale	25,277	168,378
Other assets—interest rate derivatives	24,867	46,418
Accrued interest receivable	60,844	66,790
Financial Liabilities
Deposits	13,565,863	12,429,373
Federal Home Loan Bank borrowings	183,920	549,003
Other borrowings	141,893	241,950
Junior subordinated debt	132,860
Subordinated debt and junior subordinated debt		192,291
Other liabilities—interest rate derivatives	26,388	49,917
Accrued interest payable	1,901	4,314
Fair Value Estimate [Member]
Financial Assets
Cash and due from banks	1,251,358	905,447
Equity securities	13,466	13,047
Available-for-sale debt securities	3,013,462	1,978,136
Held-to-maturity debt securities	1,028,452	768,183
Net loans	9,385,917	10,802,883
Loans held for sale	25,277	168,378
Other assets—interest rate derivatives	24,867	46,418
Accrued interest receivable	60,844	66,790
Financial Liabilities
Deposits	13,575,477	12,439,981
Federal Home Loan Bank borrowings	185,684	555,375
Other borrowings	134,288	235,796
Junior subordinated debt	109,186
Subordinated debt and junior subordinated debt		174,452
Other liabilities—interest rate derivatives	26,388	49,917
Accrued interest payable	$ 1,901	$ 4,314

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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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Subordinated debt and junior subordinated debt.

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