Fair Value Disclosures - Assets, Liabilities and Off-balance Sheet Items Not Measured at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Assets:
Held-to-maturity securities	$ 124,022	$ 128,277
Deposits:
Time deposits	1,392,394	1,153,792
Subordinated notes	148,886	148,761
Estimate of Fair Value Measurement
Assets:
Cash and short-term interest-earning assets	201,606	249,799
Held-to-maturity securities	124,022	128,277
Net loans and leases held for investment	6,399,696	6,290,455
Servicing rights	10,427	17,724
Total assets	6,735,751	6,686,255
Deposits:
Demand and savings deposits, non-maturity	5,012,964	5,221,989
Time deposits	1,386,996	1,153,775
Total deposits	6,399,960	6,375,764
Short-term borrowings	4,816	6,306
Long-term debt	249,389	310,817
Subordinated notes	141,250	140,500
Total liabilities	6,795,415	6,833,387
Estimate of Fair Value Measurement | Level 1
Assets:
Cash and short-term interest-earning assets	201,606	249,799
Held-to-maturity securities	0	0
Net loans and leases held for investment	0	0
Servicing rights	0	0
Total assets	201,606	249,799
Deposits:
Demand and savings deposits, non-maturity	5,012,964	5,221,989
Time deposits	0	0
Total deposits	5,012,964	5,221,989
Short-term borrowings	4,816	6,306
Long-term debt	0	0
Subordinated notes	0	0
Total liabilities	5,017,780	5,228,295
Estimate of Fair Value Measurement | Level 2
Assets:
Cash and short-term interest-earning assets	0	0
Held-to-maturity securities	124,022	128,277
Net loans and leases held for investment	0	0
Servicing rights	0	0
Total assets	124,022	128,277
Deposits:
Demand and savings deposits, non-maturity	0	0
Time deposits	1,386,996	1,153,775
Total deposits	1,386,996	1,153,775
Short-term borrowings	0	0
Long-term debt	249,389	310,817
Subordinated notes	141,250	140,500
Total liabilities	1,777,635	1,605,092
Estimate of Fair Value Measurement | Level 3
Assets:
Cash and short-term interest-earning assets	0	0
Held-to-maturity securities	0	0
Net loans and leases held for investment	6,399,696	6,290,455
Servicing rights	10,427	17,724
Total assets	6,410,123	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
Assets:
Cash and short-term interest-earning assets	201,606	249,799
Held-to-maturity securities	143,474	145,777
Federal Home Loan Bank, Federal Reserve Bank and other stock	37,394	40,499
Net loans and leases held for investment	6,475,729	6,462,867
Servicing rights	5,681	8,982
Total assets	6,863,884	6,907,924
Deposits:
Demand and savings deposits, non-maturity	5,012,964	5,221,989
Time deposits	1,392,394	1,153,792
Total deposits	6,405,358	6,375,781
Short-term borrowings	4,816	6,306
Long-term debt	250,000	310,000
Subordinated notes	148,886	148,761
Total liabilities	$ 6,809,060	$ 6,840,848