Fair Value Disclosures - Assets, Liabilities and Off-balance Sheet Items Not Measured at Fair Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Assets:
Held-to-maturity securities	$ 128,277	$ 134,068
Deposits:
Time deposits	1,153,792	519,084
Subordinated notes	148,761	148,260
Fair Value [Member]
Assets:
Cash and short-term interest-earning assets	249,799	152,799
Held-to-maturity securities	128,277	134,068
Net loans and leases held for investment	6,290,455	5,912,050
Servicing rights	17,724	16,826
Total assets	6,686,255	6,215,743
Deposits:
Demand and savings deposits, non-maturity	5,221,989	5,394,442
Time deposits	1,153,775	503,576
Total deposits	6,375,764	5,898,018
Short-term borrowings	6,306	197,141
Long-term debt	310,817	91,926
Subordinated notes	140,500	147,250
Total liabilities	6,833,387	6,334,335
Fair Value [Member] | Level 1 [Member]
Assets:
Cash and short-term interest-earning assets	249,799	152,799
Held-to-maturity securities	0	0
Net loans and leases held for investment	0	0
Servicing rights	0	0
Total assets	249,799	152,799
Deposits:
Demand and savings deposits, non-maturity	5,221,989	5,394,442
Time deposits	0	0
Total deposits	5,221,989	5,394,442
Short-term borrowings	6,306	0
Long-term debt	0	0
Subordinated notes	0	0
Total liabilities	5,228,295	5,394,442
Fair Value [Member] | Level 2 [Member]
Assets:
Cash and short-term interest-earning assets	0	0
Held-to-maturity securities	128,277	134,068
Net loans and leases held for investment	0	0
Servicing rights	0	0
Total assets	128,277	134,068
Deposits:
Demand and savings deposits, non-maturity	0	0
Time deposits	1,153,775	503,576
Total deposits	1,153,775	503,576
Short-term borrowings	0	197,141
Long-term debt	310,817	91,926
Subordinated notes	140,500	147,250
Total liabilities	1,605,092	939,893
Fair Value [Member] | Level 3 [Member]
Assets:
Cash and short-term interest-earning assets	0	0
Held-to-maturity securities	0	0
Net loans and leases held for investment	6,290,455	5,912,050
Servicing rights	17,724	16,826
Total assets	6,308,179	5,928,876
Deposits:
Demand and savings deposits, non-maturity	0	0
Time deposits	0	0
Total deposits	0	0
Short-term borrowings	0	0
Long-term debt	0	0
Subordinated notes	0	0
Total liabilities	0	0
Carrying Amount [Member]
Assets:
Cash and short-term interest-earning assets	249,799	152,799
Held-to-maturity securities	145,777	154,727
Federal Home Loan Bank, Federal Reserve Bank and other stock	40,499	33,841
Net loans and leases held for investment	6,462,867	6,033,640
Servicing rights	8,982	8,572
Total assets	6,907,924	6,383,579
Deposits:
Demand and savings deposits, non-maturity	5,221,989	5,394,442
Time deposits	1,153,792	519,084
Total deposits	6,375,781	5,913,526
Short-term borrowings	6,306	197,141
Long-term debt	310,000	95,000
Subordinated notes	148,761	148,260
Total liabilities	$ 6,840,848	$ 6,353,927