Loans and Allowance for Loan Losses - Loans modified under the terms of a TDR (Details 7) (Loans Receivable, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 Contract	Mar. 31, 2012 Contract
Loans modified under the terms of a TDR
Number of Contracts	37	86
Pre-Modification Outstanding Recorded Investment	$ 7,303	$ 47,694
Post Modification Outstanding Recorded Investment	7,068	45,763
Number of Contracts	10	9
Recorded Investment	2,126	6,066
Residential mortgage
Loans modified under the terms of a TDR
Number of Contracts	11	24
Pre-Modification Outstanding Recorded Investment	2,115	5,279
Post Modification Outstanding Recorded Investment	2,115	5,273
Number of Contracts	1	3
Recorded Investment	68	373
Residential construction
Loans modified under the terms of a TDR
Number of Contracts	5	14
Pre-Modification Outstanding Recorded Investment	784	3,751
Post Modification Outstanding Recorded Investment	655	3,189
Number of Contracts	2	3
Recorded Investment	117	1,476
Consumer installment
Loans modified under the terms of a TDR
Number of Contracts	4	7
Pre-Modification Outstanding Recorded Investment	21	60
Post Modification Outstanding Recorded Investment	21	55
Number of Contracts	3
Recorded Investment	20
Commercial Portfolio Segment
Loans modified under the terms of a TDR
Number of Contracts	17	41
Pre-Modification Outstanding Recorded Investment	4,383	38,604
Post Modification Outstanding Recorded Investment	4,277	37,246
Number of Contracts	4	3
Recorded Investment	1,921	4,217
Commercial Portfolio Segment | Commercial (secured by real estate)
Loans modified under the terms of a TDR
Number of Contracts	8	24
Pre-Modification Outstanding Recorded Investment	3,568	15,099
Post Modification Outstanding Recorded Investment	3,568	13,741
Number of Contracts	1
Recorded Investment	432
Commercial Portfolio Segment | Commercial & industrial
Loans modified under the terms of a TDR
Number of Contracts	9	10
Pre-Modification Outstanding Recorded Investment	815	2,724
Post Modification Outstanding Recorded Investment	709	2,724
Number of Contracts	1	1
Recorded Investment	35	43
Commercial Portfolio Segment | Commercial construction
Loans modified under the terms of a TDR
Number of Contracts		7
Pre-Modification Outstanding Recorded Investment		20,781
Post Modification Outstanding Recorded Investment		20,781
Number of Contracts	2	2
Recorded Investment	$ 1,454	$ 4,174