Fair Value (Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Carrying amounts and estimated fair values of financial instruments:
Securities available for sale	$ 178,765	$ 158,018	$ 153,238
Securities held to maturity	162,858	182,411	57,601
Total loans, net of allowance	2,451,648	2,355,548	2,381,959
Accrued interest receivable	9,008	8,920	8,885
FDIC Indemnification Asset.	7,649	22,569	25,328
Bank-owned life insurance	56,557	55,421	44,996
Accrued interest payable	588	686	$ 695
Carrying Amount [Member]
Carrying amounts and estimated fair values of financial instruments:
Cash and due from banks, noninterest-bearing	52,788	81,068
Due from banks, interest-bearing	165,271	171,248
Federal funds sold	730	768
Securities available for sale	178,765	158,018
Securities held to maturity	160,048	178,687
Presold mortgages in process of settlement	3,150	6,019
Total loans, net of allowance	2,451,648	2,355,548
Accrued interest receivable	9,008	8,920
FDIC Indemnification Asset.	7,649	22,569
Bank-owned life insurance	56,557	55,421
Deposits	2,707,753	2,695,906
Borrowings	176,394	116,394
Accrued interest payable	588	686
Fair Value [Member]
Carrying amounts and estimated fair values of financial instruments:
Cash and due from banks, noninterest-bearing	52,788	81,068
Due from banks, interest-bearing	165,271	171,248
Federal funds sold	730	768
Securities available for sale	178,765	158,018
Securities held to maturity	162,858	182,411
Presold mortgages in process of settlement	3,150	6,019
Total loans, net of allowance	2,442,464	2,328,244
Accrued interest receivable	9,008	8,920
FDIC Indemnification Asset.	7,541	21,856
Bank-owned life insurance	56,557	55,421
Deposits	2,707,338	2,696,153
Borrowings	168,091	105,407
Accrued interest payable	588	686
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