Fair Value Measurement - Estimated Fair Values of Financial Instruments that are Reported at Amortized Cost in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Financial assets:
Cash and due from banks	$ 91,377	$ 57,032
Cash at Federal Reserve and other banks	155,132	711,389
Securities held to maturity	168,038	199,759
Financial liabilities:
Other borrowings	47,068	50,087
Junior subordinated debt	101,024	58,079
Level 3 | Overdraft Privilege Commitments
Off-balance sheet:
Contract Amount	125,205	125,670
Level 3 | Standby letters of credit
Off-balance sheet:
Contract Amount	26,459	21,871
Level 3 | Commitments
Off-balance sheet:
Contract Amount	2,197,235	1,586,068
Carrying Amount | Level 1
Financial assets:
Cash and due from banks	91,377	57,032
Cash at Federal Reserve and other banks	201,240	711,389
Carrying Amount | Level 2
Financial assets:
Securities held to maturity	168,038	199,759
Restricted equity securities	17,250	17,250
Financial liabilities:
Deposits	8,655,769	7,367,159
Other borrowings	47,068	50,087
Carrying Amount | Level 3
Financial assets:
Loans, net	6,212,802	4,831,248
Financial liabilities:
Junior subordinated debt	101,024	58,079
Fair Value | Level 1
Financial assets:
Cash and due from banks	91,377	57,032
Cash at Federal Reserve and other banks	201,240	711,389
Fair Value | Level 2
Financial assets:
Securities held to maturity	153,463	208,140
Financial liabilities:
Deposits	8,648,844	7,366,422
Other borrowings	47,068	50,087
Fair Value | Level 3
Financial assets:
Loans, net	6,125,823	4,880,044
Financial liabilities:
Junior subordinated debt	106,631	57,173
Fair Value | Level 3 | Overdraft Privilege Commitments
Off-balance sheet:
Fair Value	1,252	1,257
Fair Value | Level 3 | Standby letters of credit
Off-balance sheet:
Fair Value	265	219
Fair Value | Level 3 | Commitments
Off-balance sheet:
Fair Value	$ 21,972	$ 15,861