Fair Value Disclosures - Assets, Liabilities and Off-balance Sheet Items Not Measured at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021
Assets:
Held-to-maturity securities	$ 145,792	$ 178,402
Total assets	0		$ 118
Deposits:
Time Deposits	424,610	484,166
Subordinated notes	99,030	98,874
Estimate of Fair Value Measurement [Member]
Assets:
Cash and short-term interest-earning assets	94,777	890,150
Held-to-maturity securities	145,792	178,402
Net loans and leases held for investment	5,562,620	5,244,504
Servicing rights	16,731	11,331
Total assets	5,819,920	6,324,387
Deposits:
Demand and savings deposits, non-maturity	5,138,438	5,570,958
Time Deposits	415,301	487,874
Total deposits	5,553,739	6,058,832
Short-term borrowings	97,606	20,106
Long-term debt	92,491	95,707
Subordinated notes	98,750	107,000
Total liabilities	5,842,586	6,281,645
Estimate of Fair Value Measurement [Member] | Level 1 [Member]
Assets:
Cash and short-term interest-earning assets	94,777	890,150
Held-to-maturity securities	0	0
Net loans and leases held for investment	0	0
Servicing rights	0	0
Total assets	94,777	890,150
Deposits:
Demand and savings deposits, non-maturity	5,138,438	5,570,958
Time Deposits	0	0
Total deposits	5,138,438	5,570,958
Short-term borrowings	0	0
Long-term debt	0	0
Subordinated notes	0	0
Total liabilities	5,138,438	5,570,958
Estimate of Fair Value Measurement [Member] | Level 2 [Member]
Assets:
Cash and short-term interest-earning assets	0	0
Held-to-maturity securities	145,792	178,402
Net loans and leases held for investment	0	0
Servicing rights	0	0
Total assets	145,792	178,402
Deposits:
Demand and savings deposits, non-maturity	0	0
Time Deposits	415,301	487,874
Total deposits	415,301	487,874
Short-term borrowings	97,606	20,106
Long-term debt	92,491	95,707
Subordinated notes	98,750	107,000
Total liabilities	704,148	710,687
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	5,562,620	5,244,504
Servicing rights	16,731	11,331
Total assets	5,579,351	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	94,777	890,150
Held-to-maturity securities	159,808	176,983
Federal Home Loan Bank, Federal Reserve Bank and other stock	29,116	28,186
Net loans and leases held for investment	5,577,713	5,204,927
Servicing rights	8,372	7,878
Total assets	5,869,786	6,308,124
Deposits:
Demand and savings deposits, non-maturity	5,138,438	5,570,958
Time Deposits	424,610	484,166
Total deposits	5,563,048	6,055,124
Short-term borrowings	97,606	20,106
Long-term debt	95,000	95,000
Subordinated notes	99,030	98,874
Total liabilities	$ 5,854,684	$ 6,269,104