Loans and Allowance for Loan Losses - Loans modified under terms of TDR (Details 9) (Loans Receivable, USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013 Contract	Jun. 30, 2012 Contract	Jun. 30, 2013 Contract	Jun. 30, 2012 Contract
Loans modified under the terms of a TDR
Number of Contracts	13	72	50	158
Pre-Modification Outstanding Recorded Investment	$ 7,511	$ 29,251	$ 14,814	$ 76,945
Post Modification Outstanding Recorded Investment	7,367	27,711	14,435	73,474
Number of Contracts	1	7	11	16
Recorded Investment	40	2,466	2,166	8,532
Residential mortgage
Loans modified under the terms of a TDR
Number of Contracts	2	20	13	44
Pre-Modification Outstanding Recorded Investment	649	5,288	2,764	10,567
Post Modification Outstanding Recorded Investment	505	5,112	2,620	10,385
Number of Contracts	1	1	2	4
Recorded Investment	40	27	108	400
Residential construction
Loans modified under the terms of a TDR
Number of Contracts	2	20	7	34
Pre-Modification Outstanding Recorded Investment	339	7,638	1,123	11,389
Post Modification Outstanding Recorded Investment	339	6,361	994	9,550
Number of Contracts		1	2	4
Recorded Investment		121	117	1,597
Consumer installment
Loans modified under the terms of a TDR
Number of Contracts		8	4	15
Pre-Modification Outstanding Recorded Investment		210	21	270
Post Modification Outstanding Recorded Investment		210	21	265
Number of Contracts		1	3	1
Recorded Investment		6	20	6
Commercial
Loans modified under the terms of a TDR
Number of Contracts	9	24	26	65
Pre-Modification Outstanding Recorded Investment	6,523	16,115	10,906	54,719
Post Modification Outstanding Recorded Investment	6,523	16,028	10,800	53,274
Number of Contracts		4	4	7
Recorded Investment		2,312	1,921	6,529
Commercial | Commercial (secured by real estate)
Loans modified under the terms of a TDR
Number of Contracts	9	10	17	34
Pre-Modification Outstanding Recorded Investment	6,523	7,815	10,091	22,914
Post Modification Outstanding Recorded Investment	6,523	7,728	10,091	21,469
Number of Contracts		3	1	3
Recorded Investment		2,307	432	2,307
Commercial | Commercial & industrial
Loans modified under the terms of a TDR
Number of Contracts		7	9	17
Pre-Modification Outstanding Recorded Investment		598	815	3,322
Post Modification Outstanding Recorded Investment		598	709	3,322
Number of Contracts		1	1	2
Recorded Investment		5	35	48
Commercial | Commercial construction
Loans modified under the terms of a TDR
Number of Contracts		7		14
Pre-Modification Outstanding Recorded Investment		7,702		28,483
Post Modification Outstanding Recorded Investment		7,702		28,483
Number of Contracts			2	2
Recorded Investment			$ 1,454	$ 4,174