Fair Value (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Carrying amounts and estimated fair values of financial instruments:
Accrued interest receivable	$ 10,201	$ 11,779
FDIC indemnification asset	102,559	121,677	123,719	143,221
Bank-owned life insurance	27,857	2,207
Securities sold under agreements to repurchase		17,105
Accrued interest payable	1,299	1,872
Carrying Amount
Carrying amounts and estimated fair values of financial instruments:
Cash and due from banks, noninterest-bearing	96,588	80,341
Due from banks, interest-bearing	144,919	135,218
Federal funds sold		608
Securities available for sale	167,352	182,626
Securities held to maturity	56,064	57,988
Presold mortgages in process of settlement	8,490	6,090
Loans - non-covered, net of allowance	2,052,500	2,033,542
Loans - covered, net of allowance	277,555	355,426
Loans held for sale	30,393
Accrued interest receivable	10,201	11,779
FDIC indemnification asset	102,559	121,677
Bank-owned life insurance	27,857	2,207
Deposits	2,821,360	2,755,037
Securities sold under agreements to repurchase		17,105
Borrowings	46,394	133,925
Accrued interest payable	1,299	1,872
Fair Value
Carrying amounts and estimated fair values of financial instruments:
Cash and due from banks, noninterest-bearing	96,588	80,341
Due from banks, interest-bearing	144,919	135,218
Federal funds sold		608
Securities available for sale	167,352	182,626
Securities held to maturity	61,496	62,754
Presold mortgages in process of settlement	8,490	6,090
Loans - non-covered, net of allowance	1,998,620	1,987,979
Loans - covered, net of allowance	277,555	355,426
Loans held for sale	30,393
Accrued interest receivable	10,201	11,779
FDIC indemnification asset	100,396	121,004
Bank-owned life insurance	27,857	2,207
Deposits	2,823,989	2,759,504
Securities sold under agreements to repurchase		17,105
Borrowings	20,981	106,333
Accrued interest payable	1,299	1,872
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
Securities sold under agreements to repurchase	2	2
Borrowings	2	2
Accrued interest payable	$ 2	$ 2

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