Fair Value Disclosures - Assets, Liabilities and Off-balance Sheet Items Not Measured at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Assets:
Held-to-maturity securities	$ 157,924	$ 178,402
Total assets	13		$ 152
Deposits:
Time Deposits	466,275	484,166
Subordinated notes	98,952	98,874
Estimate of Fair Value Measurement [Member]
Assets:
Cash and short-term interest-earning assets	773,781	890,150
Held-to-maturity securities	157,924	178,402
Net loans and leases held for investment	5,290,440	5,244,504
Servicing rights	15,106	11,331
Total assets	6,237,251	6,324,387
Deposits:
Demand and savings deposits, non-maturity	5,581,657	5,570,958
Time Deposits	460,580	487,874
Total deposits	6,042,237	6,058,832
Short-term borrowings	18,976	20,106
Long-term debt	93,343	95,707
Subordinated notes	102,250	107,000
Total liabilities	6,256,806	6,281,645
Estimate of Fair Value Measurement [Member] | Level 1 [Member]
Assets:
Cash and short-term interest-earning assets	773,781	890,150
Held-to-maturity securities	0	0
Net loans and leases held for investment	0	0
Servicing rights	0	0
Total assets	773,781	890,150
Deposits:
Demand and savings deposits, non-maturity	5,581,657	5,570,958
Time Deposits	0	0
Total deposits	5,581,657	5,570,958
Short-term borrowings	0	0
Long-term debt	0	0
Subordinated notes	0	0
Total liabilities	5,581,657	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	157,924	178,402
Net loans and leases held for investment	0	0
Servicing rights	0	0
Total assets	157,924	178,402
Deposits:
Demand and savings deposits, non-maturity	0	0
Time Deposits	460,580	487,874
Total deposits	460,580	487,874
Short-term borrowings	18,976	20,106
Long-term debt	93,343	95,707
Subordinated notes	102,250	107,000
Total liabilities	675,149	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	5,290,440	5,244,504
Servicing rights	15,106	11,331
Total assets	5,305,546	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	773,781	890,150
Held-to-maturity securities	166,339	176,983
Federal Home Loan Bank, Federal Reserve Bank and other stock	26,330	28,186
Net loans and leases held for investment	5,302,714	5,204,927
Servicing rights	8,122	7,878
Total assets	6,277,286	6,308,124
Deposits:
Demand and savings deposits, non-maturity	5,581,657	5,570,958
Time Deposits	466,275	484,166
Total deposits	6,047,932	6,055,124
Short-term borrowings	18,976	20,106
Long-term debt	95,000	95,000
Subordinated notes	98,952	98,874
Total liabilities	$ 6,260,860	$ 6,269,104