Fair Value Measurement - Estimated Fair Values of Financial Instruments that are Reported at Amortized Cost in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Financial assets:
Cash and due from banks	$ 49,705	$ 57,032
Cash at Federal Reserve and other banks	985,978	711,389
Securities held to maturity	186,748	199,759
Financial liabilities:
Other borrowings	36,184	50,087
Junior subordinated debt	100,984	58,079
Level 3 | Overdraft Privilege Commitments
Off-balance sheet:
Contract Amount	124,816	125,670
Level 3 | Standby letters of credit
Off-balance sheet:
Contract Amount	28,472	21,871
Level 3 | Commitments
Off-balance sheet:
Contract Amount	1,974,544	1,586,068
Carrying Amount | Level 1
Financial assets:
Cash and due from banks	49,705	57,032
Cash at Federal Reserve and other banks	985,978	711,389
Carrying Amount | Level 2
Financial assets:
Securities held to maturity	186,748	199,759
Restricted equity securities	17,250	17,250
Financial liabilities:
Deposits	8,714,477	7,367,159
Other borrowings	36,184	50,087
Carrying Amount | Level 3
Financial assets:
Loans, net	5,755,926	4,831,248
Financial liabilities:
Junior subordinated debt	100,984	58,079
Fair Value | Level 1
Financial assets:
Cash and due from banks	49,705	57,032
Cash at Federal Reserve and other banks	985,978	711,389
Fair Value | Level 2
Financial assets:
Securities held to maturity	183,970	208,140
Financial liabilities:
Deposits	8,710,991	7,366,422
Other borrowings	36,184	50,087
Fair Value | Level 3
Financial assets:
Loans, net	5,761,682	4,880,044
Financial liabilities:
Junior subordinated debt	107,396	57,173
Fair Value | Level 3 | Overdraft Privilege Commitments
Off-balance sheet:
Fair Value	1,249	1,257
Fair Value | Level 3 | Standby letters of credit
Off-balance sheet:
Fair Value	285	219
Fair Value | Level 3 | Commitments
Off-balance sheet:
Fair Value	$ 19,745	$ 15,861