Fair Value Measurements (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Fair value of financial assets
Securities - held to maturity	$ 99,258		$ 89,036
FHLB and FRB stock	21,035		21,259
Financial Liabilities:
Time deposits	916,975		898,081
Fed funds purchased and securities sold under agreements to repurchase	135,769		147,037
Other borrowings	330,850		356,541
Trust preferred debentures	37,380		37,337
Carrying Amount [Member]
Fair value of financial assets
Cash and cash equivalaents	63,996		56,070
Securities - held to maturity	97,066		88,168
FHLB and FRB stock	21,035		21,259
Accrued interest receivable	16,857		16,518
Loans/leases, net	3,398,072	[1]	3,364,291	[1]
Financial Liabilities:
Time deposits	916,975		898,081
Other deposits	3,365,791		3,271,073
Fed funds purchased and securities sold under agreements to repurchase	135,769		147,037
Other borrowings	319,930		345,580
Trust preferred debentures	37,380		37,337
Accrued interest payable	1,941		1,868
Fair Value [Member]
Fair value of financial assets
Cash and cash equivalaents	63,996		56,070
Securities - held to maturity	99,258		89,036
FHLB and FRB stock	21,035		21,259
Accrued interest receivable	16,857		16,518
Loans/leases, net	3,419,850	[1]	3,383,742	[1]
Financial Liabilities:
Time deposits	919,364		899,871
Other deposits	3,365,791		3,271,073
Fed funds purchased and securities sold under agreements to repurchase	139,020		151,201
Other borrowings	323,503		350,043
Trust preferred debentures	39,037		39,453
Accrued interest payable	1,941		1,868
Level 1 [Member]
Fair value of financial assets
Cash and cash equivalaents	63,996		56,070
Level 2 [Member]
Fair value of financial assets
Securities - held to maturity	99,258		89,036
FHLB and FRB stock	21,035		21,259
Accrued interest receivable	16,857		16,518
Loans/leases, net	2,881	[1]	2,891	[1]
Financial Liabilities:
Time deposits	919,364		899,871
Other deposits	3,365,791		3,271,073
Fed funds purchased and securities sold under agreements to repurchase	139,020		151,201
Other borrowings	323,503		350,043
Trust preferred debentures	39,037		39,453
Accrued interest payable	1,941		1,868
Level 3 [Member]
Fair value of financial assets
Loans/leases, net	$ 3,416,969	[1]	$ 3,380,851	[1]

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