Fair Value Measurement - Estimated Fair Values of Financial Instruments that are Reported at Amortized Cost in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Financial assets:
Cash and due from banks	$ 49,630	$ 57,032
Cash at Federal Reserve and other banks	439,238	711,389
Securities held to maturity	176,794	199,759
Financial liabilities:
Other borrowings	35,089	50,087
Junior subordinated debt	101,003	58,079
Level 3 | Overdraft Privilege Commitments
Off-balance sheet:
Contract Amount	123,278	125,670
Level 3 | Standby letters of credit
Off-balance sheet:
Contract Amount	38,633	21,871
Level 3 | Commitments
Off-balance sheet:
Contract Amount	2,041,591	1,586,068
Carrying Amount | Level 1
Financial assets:
Cash and due from banks	49,630	57,032
Cash at Federal Reserve and other banks	439,238	711,389
Carrying Amount | Level 2
Financial assets:
Securities held to maturity	176,794	199,759
Restricted equity securities	17,250	17,250
Financial liabilities:
Deposits	8,756,775	7,367,159
Other borrowings	35,089	50,087
Carrying Amount | Level 3
Financial assets:
Loans, net	6,015,477	4,831,248
Financial liabilities:
Junior subordinated debt	101,003	58,079
Fair Value | Level 1
Financial assets:
Cash and due from banks	49,630	57,032
Cash at Federal Reserve and other banks	439,238	711,389
Fair Value | Level 2
Financial assets:
Securities held to maturity	171,142	208,140
Financial liabilities:
Deposits	8,751,521	7,366,422
Other borrowings	35,089	50,087
Fair Value | Level 3
Financial assets:
Loans, net	6,050,367	4,880,044
Financial liabilities:
Junior subordinated debt	106,750	57,173
Fair Value | Level 3 | Overdraft Privilege Commitments
Off-balance sheet:
Fair Value	1,233	1,257
Fair Value | Level 3 | Standby letters of credit
Off-balance sheet:
Fair Value	386	219
Fair Value | Level 3 | Commitments
Off-balance sheet:
Fair Value	$ 20,416	$ 15,861