Fair Value Disclosures - Assets, Liabilities and Off-balance Sheet Items Not Measured at Fair Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Assets:
Held-to-maturity securities	$ 115,007	$ 128,277
Deposits:
Time deposits	1,453,706	1,153,792
Subordinated notes	149,261	148,761
Fair Value [Member]
Assets:
Cash and short-term interest-earning assets	328,844	249,799
Held-to-maturity securities	115,007	128,277
Net loans and leases held for investment	6,586,054	6,290,455
Servicing rights	12,710	17,724
Total assets	7,042,615	6,686,255
Deposits:
Demand and savings deposits, non-maturity	5,305,553	5,221,989
Time deposits	1,458,774	1,153,775
Total deposits	6,764,327	6,375,764
Short-term borrowings	11,181	6,306
Long-term debt	225,475	310,817
Subordinated notes	147,500	140,500
Total liabilities	7,148,483	6,833,387
Fair Value [Member] | Level 1 [Member]
Assets:
Cash and short-term interest-earning assets	328,844	249,799
Held-to-maturity securities	0	0
Net loans and leases held for investment	0	0
Servicing rights	0	0
Total assets	328,844	249,799
Deposits:
Demand and savings deposits, non-maturity	5,305,553	5,221,989
Time deposits	0	0
Total deposits	5,305,553	5,221,989
Short-term borrowings	11,181	6,306
Long-term debt	0	0
Subordinated notes	0	0
Total liabilities	5,316,734	5,228,295
Fair Value [Member] | Level 2 [Member]
Assets:
Cash and short-term interest-earning assets	0	0
Held-to-maturity securities	115,007	128,277
Net loans and leases held for investment	0	0
Servicing rights	0	0
Total assets	115,007	128,277
Deposits:
Demand and savings deposits, non-maturity	0	0
Time deposits	1,458,774	1,153,775
Total deposits	1,458,774	1,153,775
Short-term borrowings	0	0
Long-term debt	225,475	310,817
Subordinated notes	147,500	140,500
Total liabilities	1,831,749	1,605,092
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	6,586,054	6,290,455
Servicing rights	12,710	17,724
Total assets	6,598,764	6,308,179
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	328,844	249,799
Held-to-maturity securities	134,111	145,777
Federal Home Loan Bank, Federal Reserve Bank and other stock	38,980	40,499
Net loans and leases held for investment	6,729,381	6,462,867
Servicing rights	6,990	8,982
Total assets	7,238,306	6,907,924
Deposits:
Demand and savings deposits, non-maturity	5,305,553	5,221,989
Time deposits	1,453,706	1,153,792
Total deposits	6,759,259	6,375,781
Short-term borrowings	11,181	6,306
Long-term debt	225,000	310,000
Subordinated notes	149,261	148,761
Total liabilities	$ 7,144,701	$ 6,840,848