Loans and Allowance for Loan Losses (Details 9) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	$ 44,408	$ 39,846	$ 33,875	$ 32,300
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	33,456	26,612	35,960	29,268
Impaired Financing Receivable, with Related Allowance, Interest Income	348	267	496	438
Impaired Financing Receivable, with No Related Allowance, Interest Income	126	371	356	590
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	23,271	19,147	14,945	12,375
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	11,502	7,066	15,180	8,918
Impaired Financing Receivable, with Related Allowance, Interest Income	215	96	272	146
Impaired Financing Receivable, with No Related Allowance, Interest Income	102	186	276	298
Commercial Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	6,837	7,461	7,060	8,810
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	10,732	10,042	9,987	11,564
Impaired Financing Receivable, with Related Allowance, Interest Income	50	93	91	145
Impaired Financing Receivable, with No Related Allowance, Interest Income	8	107	32	189
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	531	1,297	305	1,933
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	579	577	623	661
Impaired Financing Receivable, with Related Allowance, Interest Income	4	11	4	39
Impaired Financing Receivable, with No Related Allowance, Interest Income	1	7	4	10
Residential Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	435	314	338	157
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0	204	0	737
Impaired Financing Receivable, with Related Allowance, Interest Income	3	4	5	4
Impaired Financing Receivable, with No Related Allowance, Interest Income	0	0	0	9
Residential Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	13,284	11,553	11,202	8,988
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	10,627	8,680	10,120	7,306
Impaired Financing Receivable, with Related Allowance, Interest Income	76	63	124	104
Impaired Financing Receivable, with No Related Allowance, Interest Income	15	67	44	80
Consumer and Other [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	50	74	25	37
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	16	43	50	82
Impaired Financing Receivable, with Related Allowance, Interest Income	0	0	0	0
Impaired Financing Receivable, with No Related Allowance, Interest Income	$ 0	$ 4	$ 0	$ 4