Fair Value (Details 2) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Fair value of financial assets
Securities - held to maturity		$ 150,139	$ 146,686
FHLB and FRB stock		25,727	29,969
Financial Liabilities:
Time deposits		887,142	855,133
Fed funds purchased and securities sold under agreements to repurchase		116,551	136,513
Other borrowings		455,341	536,285
Trust preferred debentures		37,552	37,509
Carrying Amount [Member]
Fair value of financial assets
Cash and cash equivalaents		55,514	58,257
Securities - held to maturity		145,010	146,071
FHLB and FRB stock		25,727	29,969
Accrued interest receivable		17,484	16,433
Loans and leases, net	[1]	3,788,383	3,740,038
Financial Liabilities:
Time deposits		887,142	855,133
Other deposits		3,668,086	3,540,173
Fed funds purchased and securities sold under agreements to repurchase		116,551	136,513
Other borrowings		444,823	525,709
Trust preferred debentures		37,552	37,509
Accrued interest payable		1,879	1,973
Fair Value [Member]
Fair value of financial assets
Cash and cash equivalaents		55,514	58,257
Securities - held to maturity		150,139	146,686
FHLB and FRB stock		25,727	29,969
Accrued interest receivable		17,484	16,433
Loans and leases, net	[1]	3,813,734	3,739,695
Financial Liabilities:
Time deposits		887,887	853,839
Other deposits		3,668,086	3,540,173
Fed funds purchased and securities sold under agreements to repurchase		117,939	138,161
Other borrowings		446,592	527,041
Trust preferred debentures		43,345	45,190
Accrued interest payable		1,879	1,973
Level 1 [Member]
Fair value of financial assets
Cash and cash equivalaents		55,514	58,257
Securities - held to maturity		0	0
FHLB and FRB stock		0	0
Accrued interest receivable		0	0
Loans and leases, net	[1]	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 [Member]
Fair value of financial assets
Cash and cash equivalaents		0	0
Securities - held to maturity		150,139	146,686
FHLB and FRB stock		25,727	29,969
Accrued interest receivable		17,484	16,433
Loans and leases, net	[1]	1,987	5,730
Financial Liabilities:
Time deposits		887,887	853,839
Other deposits		3,668,086	3,540,173
Fed funds purchased and securities sold under agreements to repurchase		117,939	138,161
Other borrowings		446,592	527,041
Trust preferred debentures		43,345	45,190
Accrued interest payable		1,879	1,973
Level 3 [Member]
Fair value of financial assets
Cash and cash equivalaents		0	0
Securities - held to maturity		0	0
FHLB and FRB stock		0	0
Accrued interest receivable		0	0
Loans and leases, net	[1]	3,811,747	3,733,965
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

[1] Lease receivables, although excluded from the scope of ASC Topic 825, are included in the estimated fair value amounts at their carrying value.