Fair Value (Details 2) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
Carrying amounts and estimated fair values of financial instruments:
Securities available for sale	$ 159,254	$ 173,041	$ 172,535
Securities held to maturity	57,601	56,700	56,824
Total loans, net of allowance	2,381,959	2,414,689	2,394,391
Accrued interest receivable	8,885	9,649	9,663
FDIC indemnification asset	25,328	48,622	64,946
Bank-owned life insurance	44,996	44,040	43,642
Accrued interest payable	695	879	920
Carrying Amount [Member]
Carrying amounts and estimated fair values of financial instruments:
Cash and due from banks, noninterest-bearing	84,128	83,881
Due from banks, interest-bearing	251,111	136,644
Federal funds sold	1,275	2,749
Securities available for sale	159,254	173,041
Securities held to maturity	53,821	53,995
Presold mortgages in process of settlement	5,761	5,422
Total loans, net of allowance	2,381,959	2,414,689
Accrued interest receivable	8,885	9,649
FDIC indemnification asset	25,328	48,622
Bank-owned life insurance	44,996	44,040
Deposits	2,679,012	2,751,019
Borrowings	116,394	46,394
Accrued interest payable	695	879
Fair Value [Member]
Carrying amounts and estimated fair values of financial instruments:
Cash and due from banks, noninterest-bearing	84,128	83,881
Due from banks, interest-bearing	251,111	136,644
Federal funds sold	1,275	2,749
Securities available for sale	159,254	173,041
Securities held to maturity	57,601	56,700
Presold mortgages in process of settlement	5,761	5,422
Total loans, net of allowance	2,331,525	2,352,834
Accrued interest receivable	8,885	9,649
FDIC indemnification asset	24,452	47,032
Bank-owned life insurance	44,996	44,040
Deposits	2,679,281	2,752,375
Borrowings	106,139	34,795
Accrued interest payable	695	879
Level in Fair Value Hierachy [Member]
Carrying amounts and estimated fair values of financial instruments:
Cash and due from banks, noninterest-bearing	1	1
Due from banks, interest-bearing	1	1
Federal funds sold	1	1
Securities available for sale	2	2
Securities held to maturity	2	2
Presold mortgages in process of settlement	1	1
Total loans, net of allowance	3	3
Accrued interest receivable	1	1
FDIC indemnification asset	3	3
Bank-owned life insurance	1	1
Deposits	2	2
Borrowings	2	2
Accrued interest payable	$ 2	$ 2