Fair Value (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Carrying amounts and estimated fair values of financial instruments:
Accrued interest receivable	$ 9,737	$ 10,201	$ 10,969
FDIC indemnification asset	100,594	102,559	113,405
Bank-owned life insurance	28,065	27,857	2,219
Accrued interest payable	1,118	1,299	1,659
Carrying Amount
Carrying amounts and estimated fair values of financial instruments:
Cash and due from banks, noninterest-bearing	73,205	96,588
Due from banks, interest-bearing	242,890	144,919
Federal funds sold	249
Securities available for sale	170,214	167,352
Securities held to maturity	55,649	56,064
Presold mortgages in process of settlement	4,584	8,490
Loans - non-covered, net of allowance	2,087,922	2,052,500
Loans - covered, net of allowance	258,440	277,555
Loans held for sale		30,393
Accrued interest receivable	9,737	10,201
FDIC indemnification asset	100,594	102,559
Bank-owned life insurance	27,193	27,857
Deposits	2,857,567	2,821,360
Borrowings	46,394	46,394
Accrued interest payable	1,118	1,299
Fair Value
Carrying amounts and estimated fair values of financial instruments:
Cash and due from banks, noninterest-bearing	73,205	96,588
Due from banks, interest-bearing	242,890	144,919
Federal funds sold	249
Securities available for sale	170,214	167,352
Securities held to maturity	60,758	61,496
Presold mortgages in process of settlement	4,584	8,490
Loans - non-covered, net of allowance	2,035,916	1,998,620
Loans - covered, net of allowance	258,440	277,555
Loans held for sale		30,393
Accrued interest receivable	9,737	10,201
FDIC indemnification asset	98,818	100,396
Bank-owned life insurance	27,193	27,857
Deposits	2,860,592	2,823,989
Borrowings	20,457	20,981
Accrued interest payable	1,118	1,299
Level in Fair Value Hierachy
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
Loans - non-covered, net of allowance	3	3
Loans - covered, net of allowance	3	3
Loans held for sale	2	2
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

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