Fair Value Disclosures - Assets, Liabilities and Off-balance Sheet Items Not Measured at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Assets:
Held-to-maturity securities	$ 123,119	$ 156,325
Total assets	118		$ 255
Deposits:
Time Deposits	492,223	563,775
Subordinated notes	98,719	183,515
Estimate of Fair Value Measurement [Member]
Assets:
Cash and short-term interest-earning assets	203,449	219,858
Held-to-maturity securities	123,119	156,325
Net loans and leases held for investment	5,317,505	5,338,782
Servicing rights	9,793	6,783
Total assets	5,653,866	5,721,748
Deposits:
Demand and savings deposits, non-maturity	4,826,481	4,678,940
Time Deposits	500,436	574,018
Total deposits	5,326,917	5,252,958
Short-term borrowings	25,251	17,906
Long-term debt	96,976	112,968
Subordinated notes	106,500	190,045
Total liabilities	5,555,644	5,573,877
Estimate of Fair Value Measurement [Member] | Level 1 [Member]
Assets:
Cash and short-term interest-earning assets	203,449	219,858
Held-to-maturity securities	0	0
Net loans and leases held for investment	0	0
Servicing rights	0	0
Total assets	203,449	219,858
Deposits:
Demand and savings deposits, non-maturity	4,826,481	4,678,940
Time Deposits	0	0
Total deposits	4,826,481	4,678,940
Short-term borrowings	0	0
Long-term debt	0	0
Subordinated notes	0	0
Total liabilities	4,826,481	4,678,940
Estimate of Fair Value Measurement [Member] | Level 2 [Member]
Assets:
Cash and short-term interest-earning assets	0	0
Held-to-maturity securities	123,119	156,325
Net loans and leases held for investment	0	0
Servicing rights	0	0
Total assets	123,119	156,325
Deposits:
Demand and savings deposits, non-maturity	0	0
Time Deposits	500,436	574,018
Total deposits	500,436	574,018
Short-term borrowings	25,251	17,906
Long-term debt	96,976	112,968
Subordinated notes	106,500	190,045
Total liabilities	729,163	894,937
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	5,317,505	5,338,782
Servicing rights	9,793	6,783
Total assets	5,327,298	5,345,565
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	203,449	219,858
Held-to-maturity securities	119,692	151,257
Federal Home Loan Bank, Federal Reserve Bank and other stock	25,228	28,183
Net loans and leases held for investment	5,226,485	5,192,710
Servicing rights	7,433	6,408
Total assets	5,582,287	5,598,416
Deposits:
Demand and savings deposits, non-maturity	4,826,481	4,678,940
Time Deposits	492,223	563,775
Total deposits	5,318,704	5,242,715
Short-term borrowings	25,251	17,906
Long-term debt	95,000	110,000
Subordinated notes	98,719	183,515
Total liabilities	$ 5,537,674	$ 5,554,136