Fair Value Disclosures - Assets, Liabilities and Off-balance Sheet Items Not Measured at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Assets:
Held-to-maturity securities	$ 114,427	$ 115,007
Deposits:
Time deposits	1,546,293	1,453,706
Subordinated notes	149,386	149,261
Estimate of Fair Value Measurement
Assets:
Cash and short-term interest-earning assets	169,134	328,844
Held-to-maturity securities	114,427	115,007
Net loans and leases held for investment	6,643,105	6,586,054
Servicing rights	11,402	12,710
Total assets	6,938,068	7,042,615
Deposits:
Demand and savings deposits, non-maturity	5,112,205	5,305,553
Time deposits	1,547,618	1,458,774
Total deposits	6,659,823	6,764,327
Short-term borrowings	4,031	11,181
Long-term debt	175,649	225,475
Subordinated notes	146,750	147,500
Total liabilities	6,986,253	7,148,483
Estimate of Fair Value Measurement | Level 1
Assets:
Cash and short-term interest-earning assets	169,134	328,844
Held-to-maturity securities	0	0
Net loans and leases held for investment	0	0
Servicing rights	0	0
Total assets	169,134	328,844
Deposits:
Demand and savings deposits, non-maturity	5,112,205	5,305,553
Time deposits	0	0
Total deposits	5,112,205	5,305,553
Short-term borrowings	4,031	11,181
Long-term debt	0	0
Subordinated notes	0	0
Total liabilities	5,116,236	5,316,734
Estimate of Fair Value Measurement | Level 2
Assets:
Cash and short-term interest-earning assets	0	0
Held-to-maturity securities	114,427	115,007
Net loans and leases held for investment	0	0
Servicing rights	0	0
Total assets	114,427	115,007
Deposits:
Demand and savings deposits, non-maturity	0	0
Time deposits	1,547,618	1,458,774
Total deposits	1,547,618	1,458,774
Short-term borrowings	0	0
Long-term debt	175,649	225,475
Subordinated notes	146,750	147,500
Total liabilities	1,870,017	1,831,749
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	6,643,105	6,586,054
Servicing rights	11,402	12,710
Total assets	6,654,507	6,598,764
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	169,134	328,844
Held-to-maturity securities	130,889	134,111
Federal Home Loan Bank, Federal Reserve Bank and other stock	35,732	38,980
Net loans and leases held for investment	6,737,217	6,729,381
Servicing rights	6,872	6,990
Total assets	7,079,844	7,238,306
Deposits:
Demand and savings deposits, non-maturity	5,112,205	5,305,553
Time deposits	1,546,293	1,453,706
Total deposits	6,658,498	6,759,259
Short-term borrowings	4,031	11,181
Long-term debt	175,000	225,000
Subordinated notes	149,386	149,261
Total liabilities	$ 6,986,915	$ 7,144,701