Fair Value Measurements - Estimated Fair Value of Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financial Assets:
FHLB and other stock	$ 24,212	$ 33,695
Financial Liabilities:
Time deposits	708,933	675,014
Fed funds purchased and securities sold under agreements to repurchase	68,993	60,346
Other borrowings	457,983	658,100
Trust preferred debentures	17,078	17,035
Level 1
Financial Assets:
Cash and cash equivalents	115,263	137,982
FHLB and other stock	0	0
Accrued interest receivable	0	0
Loans/leases, net	0	0
Financial Liabilities:
Time deposits	0	0
Other deposits	0	0
Fed funds purchased and securities sold under agreements to repurchase	0	0
Other borrowings	0	0
Trust preferred debentures	0	0
Accrued interest payable	0	0
Level 2
Financial Assets:
Cash and cash equivalents	0	0
FHLB and other stock	24,212	33,695
Accrued interest receivable	18,007	19,293
Loans/leases, net	4,893	14,050
Financial Liabilities:
Time deposits	716,275	677,205
Other deposits	4,700,430	4,537,907
Fed funds purchased and securities sold under agreements to repurchase	68,993	60,346
Other borrowings	466,974	659,895
Trust preferred debentures	20,138	21,904
Accrued interest payable	2,244	2,486
Level 3
Financial Assets:
Cash and cash equivalents	0	0
FHLB and other stock	0	0
Accrued interest receivable	0	0
Loans/leases, net	4,829,507	4,784,218
Financial Liabilities:
Time deposits	0	0
Other deposits	0	0
Fed funds purchased and securities sold under agreements to repurchase	0	0
Other borrowings	0	0
Trust preferred debentures	0	0
Accrued interest payable	0	0
Carrying Amount
Financial Assets:
Cash and cash equivalents	115,263	137,982
FHLB and other stock	24,212	33,695
Accrued interest receivable	18,007	19,293
Loans/leases, net	4,885,418	4,877,658
Financial Liabilities:
Time deposits	708,933	675,014
Other deposits	4,700,430	4,537,907
Fed funds purchased and securities sold under agreements to repurchase	68,993	60,346
Other borrowings	457,983	658,100
Trust preferred debentures	17,078	17,035
Accrued interest payable	2,244	2,486
Fair Value
Financial Assets:
Cash and cash equivalents	115,263	137,982
FHLB and other stock	24,212	33,695
Accrued interest receivable	18,007	19,293
Loans/leases, net	4,834,400	4,798,268
Financial Liabilities:
Time deposits	716,275	677,205
Other deposits	4,700,430	4,537,907
Fed funds purchased and securities sold under agreements to repurchase	68,993	60,346
Other borrowings	466,974	659,895
Trust preferred debentures	20,138	21,904
Accrued interest payable	$ 2,244	$ 2,486