Fair Value - Estimated Fair Value of Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financial Assets:
Securities - held to maturity	$ 140,422	$ 139,377
FHLB and other stock	45,088	52,262
Financial Liabilities:
Time deposits	661,712	637,295
Fed funds purchased and securities sold under agreements to repurchase	66,918	81,842
Other borrowings	923,427	1,076,075
Trust preferred debentures	16,906	16,863
Level 1
Financial Assets:
Cash and cash equivalents	70,574	80,389
Securities - held to maturity	0	0
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
Securities - held to maturity	140,422	139,377
FHLB and other stock	45,088	52,262
Accrued interest receivable	23,990	20,922
Loans/leases, net	4,786	6,500
Financial Liabilities:
Time deposits	657,705	631,489
Other deposits	4,328,213	4,251,664
Fed funds purchased and securities sold under agreements to repurchase	66,918	81,842
Other borrowings	922,053	1,074,081
Trust preferred debentures	22,165	21,921
Accrued interest payable	2,135	2,408
Level 3
Financial Assets:
Cash and cash equivalents	0	0
Securities - held to maturity	0	0
FHLB and other stock	0	0
Accrued interest receivable	0	0
Loans/leases, net	4,652,826	4,642,808
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	70,574	80,389
Securities - held to maturity	139,642	140,579
FHLB and other stock	45,088	52,262
Accrued interest receivable	23,990	20,922
Loans/leases, net	4,749,372	4,790,529
Financial Liabilities:
Time deposits	661,712	637,295
Other deposits	4,328,213	4,251,664
Fed funds purchased and securities sold under agreements to repurchase	66,918	81,842
Other borrowings	923,427	1,076,075
Trust preferred debentures	16,906	16,863
Accrued interest payable	2,135	2,408
Fair Value
Financial Assets:
Cash and cash equivalents	70,574	80,389
Securities - held to maturity	140,422	139,377
FHLB and other stock	45,088	52,262
Accrued interest receivable	23,990	20,922
Loans/leases, net	4,657,612	4,649,308
Financial Liabilities:
Time deposits	657,705	631,489
Other deposits	4,328,213	4,251,664
Fed funds purchased and securities sold under agreements to repurchase	66,918	81,842
Other borrowings	922,053	1,074,081
Trust preferred debentures	22,165	21,921
Accrued interest payable	$ 2,135	$ 2,408