Fair Value Measurement - Estimated Fair Values of Financial Instruments that are Reported at Amortized Cost in Consolidated Balance Sheets (Detail) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Financial assets:
Cash and due from banks	$ 96,323,000	$ 57,032,000
Cash at Federal Reserve and other banks	10,907,000	711,389,000
Securities held to maturity	160,983,000	199,759,000
Restricted equity securities	0	0
Financial liabilities:
Other borrowings	264,605,000	50,087,000
Junior subordinated debt	101,040,000	58,079,000
Level 3 | Overdraft privilege commitments
Off-balance sheet:
Contract amount, Off-balance sheet	126,634,000	125,670,000
Level 3 | Standby letters of credit
Off-balance sheet:
Contract amount, Off-balance sheet	26,599,000	21,871,000
Level 3 | Commitments
Off-balance sheet:
Contract amount, Off-balance sheet	2,188,560,000	1,586,068,000
Fair Value | Level 1
Financial assets:
Cash and due from banks	96,323,000	57,032,000
Cash at Federal Reserve and other banks	10,907,000	711,389,000
Fair Value | Level 2
Financial assets:
Securities held to maturity	149,938,000	208,140,000
Financial liabilities:
Deposits	8,321,517,000	7,366,422,000
Other borrowings	264,605,000	50,087,000
Fair Value | Level 3
Financial assets:
Loans, net	6,153,155,000	4,880,044,000
Financial liabilities:
Junior subordinated debt	92,613,000	57,173,000
Fair Value | Level 3 | Overdraft privilege commitments
Off-balance sheet:
Fair value, Off-balance sheet	1,266,000	1,257,000
Fair Value | Level 3 | Standby letters of credit
Off-balance sheet:
Fair value, Off-balance sheet	266,000	219,000
Fair Value | Level 3 | Commitments
Off-balance sheet:
Fair value, Off-balance sheet	21,886,000	15,861,000
Carrying Amount | Level 1
Financial assets:
Cash and due from banks	96,323,000	57,032,000
Cash at Federal Reserve and other banks	10,907,000	711,389,000
Carrying Amount | Level 2
Financial assets:
Securities held to maturity	160,983,000	199,759,000
Restricted equity securities	17,250,000	17,250,000
Financial liabilities:
Deposits	8,329,013,000	7,367,159,000
Other borrowings	264,605,000	50,087,000
Carrying Amount | Level 3
Financial assets:
Loans, net	6,344,767,000	4,831,248,000
Financial liabilities:
Junior subordinated debt	$ 101,040,000	$ 58,079,000