Fair Value Disclosures - Assets, Liabilities and Off-balance Sheet Items Not Measured at Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Assets:
Held-to-maturity securities	$ 123,760	$ 134,068
Total assets	0		$ 0
Deposits:
Time Deposits	1,168,519	519,084
Subordinated notes	148,636	148,260
Estimate of Fair Value Measurement [Member]
Assets:
Cash and short-term interest-earning assets	290,341	152,799
Held-to-maturity securities	123,760	134,068
Net loans and leases held for investment	6,213,204	5,912,050
Servicing rights	18,963	16,826
Total assets	6,646,268	6,215,743
Deposits:
Demand and savings deposits, non-maturity	5,270,646	5,394,442
Time Deposits	1,153,897	503,576
Total deposits	6,424,543	5,898,018
Short-term borrowings	14,676	197,141
Long-term debt	316,366	91,926
Subordinated notes	135,000	147,250
Total liabilities	6,890,585	6,334,335
Estimate of Fair Value Measurement [Member] | Level 1 [Member]
Assets:
Cash and short-term interest-earning assets	290,341	152,799
Held-to-maturity securities	0	0
Net loans and leases held for investment	0	0
Servicing rights	0	0
Total assets	290,341	152,799
Deposits:
Demand and savings deposits, non-maturity	5,270,646	5,394,442
Time Deposits	0	0
Total deposits	5,270,646	5,394,442
Short-term borrowings	0	0
Long-term debt	0	0
Subordinated notes	0	0
Total liabilities	5,270,646	5,394,442
Estimate of Fair Value Measurement [Member] | Level 2 [Member]
Assets:
Cash and short-term interest-earning assets	0	0
Held-to-maturity securities	123,760	134,068
Net loans and leases held for investment	0	0
Servicing rights	0	0
Total assets	123,760	134,068
Deposits:
Demand and savings deposits, non-maturity	0	0
Time Deposits	1,153,897	503,576
Total deposits	1,153,897	503,576
Short-term borrowings	14,676	197,141
Long-term debt	316,366	91,926
Subordinated notes	135,000	147,250
Total liabilities	1,619,939	939,893
Estimate of Fair Value Measurement [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	6,213,204	5,912,050
Servicing rights	18,963	16,826
Total assets	6,232,167	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	290,341	152,799
Held-to-maturity securities	149,451	154,727
Federal Home Loan Bank, Federal Reserve Bank and other stock	42,417	33,841
Net loans and leases held for investment	6,479,403	6,033,640
Servicing rights	8,921	8,572
Total assets	6,970,533	6,383,579
Deposits:
Demand and savings deposits, non-maturity	5,270,646	5,394,442
Time Deposits	1,168,519	519,084
Total deposits	6,439,165	5,913,526
Short-term borrowings	14,676	197,141
Long-term debt	320,000	95,000
Subordinated notes	148,636	148,260
Total liabilities	$ 6,922,477	$ 6,353,927