Fair Value Disclosures - Assets, Liabilities and Off-balance Sheet Items Not Measured at Fair Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Assets:
Held-to-maturity securities	$ 134,068	$ 178,402
Total assets	0	48
Deposits:
Time deposits	519,084	484,166
Subordinated notes	148,260	98,874
Fair Value [Member]
Assets:
Cash and short-term interest-earning assets	152,799	890,150
Held-to-maturity securities	134,068	178,402
Net loans and leases held for investment	5,912,050	5,244,504
Servicing rights	16,826	11,331
Total assets	6,215,743	6,324,387
Deposits:
Demand and savings deposits, non-maturity	5,394,442	5,570,958
Time deposits	503,576	487,874
Total deposits	5,898,018	6,058,832
Short-term borrowings	197,141	20,106
Long-term debt	91,926	95,707
Subordinated notes	147,250	107,000
Total liabilities	6,334,335	6,281,645
Fair Value [Member] | Level 1 [Member]
Assets:
Cash and short-term interest-earning assets	152,799	890,150
Held-to-maturity securities	0	0
Net loans and leases held for investment	0	0
Servicing rights	0	0
Total assets	152,799	890,150
Deposits:
Demand and savings deposits, non-maturity	5,394,442	5,570,958
Time deposits	0	0
Total deposits	5,394,442	5,570,958
Short-term borrowings	0	0
Long-term debt	0	0
Subordinated notes	0	0
Total liabilities	5,394,442	5,570,958
Fair Value [Member] | Level 2 [Member]
Assets:
Cash and short-term interest-earning assets	0	0
Held-to-maturity securities	134,068	178,402
Net loans and leases held for investment	0	0
Servicing rights	0	0
Total assets	134,068	178,402
Deposits:
Demand and savings deposits, non-maturity	0	0
Time deposits	503,576	487,874
Total deposits	503,576	487,874
Short-term borrowings	197,141	20,106
Long-term debt	91,926	95,707
Subordinated notes	147,250	107,000
Total liabilities	939,893	710,687
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	5,912,050	5,244,504
Servicing rights	16,826	11,331
Total assets	5,928,876	5,255,835
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	152,799	890,150
Held-to-maturity securities	154,727	176,983
Federal Home Loan Bank, Federal Reserve Bank and other stock	33,841	28,186
Net loans and leases held for investment	6,033,640	5,204,927
Servicing rights	8,572	7,878
Total assets	6,383,579	6,308,124
Deposits:
Demand and savings deposits, non-maturity	5,394,442	5,570,958
Time deposits	519,084	484,166
Total deposits	5,913,526	6,055,124
Short-term borrowings	197,141	20,106
Long-term debt	95,000	95,000
Subordinated notes	148,260	98,874
Total liabilities	$ 6,353,927	$ 6,269,104