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Loans, Impaired Loans, Average Investments in Impaired Loans, and Interest Income Recognized on Impaired Loans (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Total impaired loans [Abstract]          
Recorded balance $ 66,178 $ 63,418 $ 66,178 $ 63,418 $ 65,300
Unpaid Contractual Principal Balance 69,206 69,876 69,206 69,876 68,228
Specific Allowance 1,895 3,839 1,895 3,839 2,296
Average investment in impaired loans 66,817 63,648 66,730 64,993 64,890
Interest Income Recognized 689 [1] 457 [1] 1,132 [1] 989 [1] 2,083 [1]
Commercial Construction [Member]
          
Loans without a specific valuation allowance [Abstract]          
Recorded Balance 5,270 5,921 5,270 5,921 5,457
Unpaid Contractual Principal Balance 5,271 6,498 5,271 6,498 5,458
Specific Allowance 0 0 0 0 0
Average Investment in Impaired Loans 5,291 6,043 5,366 5,634 5,595
Interest Income Recognized 78 [1] 53 [1] 128 [1] 127 [1] 240 [1]
Loans with a specific valuation allowance [Abstract]          
Recorded Balance 4,285 4,655 4,285 4,655 4,353
Unpaid Contractual Principal Balance 4,285 5,511 4,285 5,511 4,359
Specific Allowance 734 1,890 734 1,890 1,189
Average Investment in Impaired Loans 4,285 4,656 4,299 5,366 4,935
Interest income recognized 0 [1] 0 [1] 0 [1] 0 [1] 0 [1]
Total impaired loans [Abstract]          
Recorded balance 9,555 10,576 9,555 10,576 9,810
Unpaid Contractual Principal Balance 9,556 12,009 9,556 12,009 9,817
Specific Allowance 734 1,890 734 1,890 1,189
Average investment in impaired loans 9,576 10,699 9,665 11,000 10,530
Interest Income Recognized 78 [1] 53 [1] 128 [1] 127 [1] 240 [1]
Commercial Secured by Real Estate [Member]
          
Loans without a specific valuation allowance [Abstract]          
Recorded Balance 33,504 29,232 33,504 29,232 35,258
Unpaid Contractual Principal Balance 34,523 30,155 34,523 30,155 36,173
Specific Allowance 0 0 0 0 0
Average Investment in Impaired Loans 33,687 29,422 35,051 31,665 32,472
Interest Income Recognized 332 [1] 236 [1] 597 [1] 533 [1] 1,231 [1]
Loans with a specific valuation allowance [Abstract]          
Recorded Balance 3,968 6,194 3,968 6,194 4,039
Unpaid Contractual Principal Balance 4,272 6,448 4,272 6,448 4,326
Specific Allowance 1,077 1,866 1,077 1,866 1,005
Average Investment in Impaired Loans 3,973 6,298 4,330 5,232 5,033
Interest income recognized 0 [1] 0 [1] 4 [1] 0 [1] 1 [1]
Total impaired loans [Abstract]          
Recorded balance 37,472 35,426 37,472 35,426 39,297
Unpaid Contractual Principal Balance 38,795 36,603 38,795 36,603 40,499
Specific Allowance 1,077 1,866 1,077 1,866 1,005
Average investment in impaired loans 37,660 35,720 39,381 36,897 37,505
Interest Income Recognized 332 [1] 236 [1] 601 [1] 533 [1] 1,232 [1]
Commercial Other [Member]
          
Loans without a specific valuation allowance [Abstract]          
Recorded Balance 16,947 16,036 16,947 16,036 14,839
Unpaid Contractual Principal Balance 18,527 19,760 18,527 19,760 16,435
Specific Allowance 0 0 0 0 0
Average Investment in Impaired Loans 17,362 15,825 15,843 15,630 15,396
Interest Income Recognized 257 [1] 151 [1] 371 [1] 305 [1] 568 [1]
Loans with a specific valuation allowance [Abstract]          
Recorded Balance 339 353 339 353 330
Unpaid Contractual Principal Balance 463 477 463 477 453
Specific Allowance 84 83 84 83 102
Average Investment in Impaired Loans 353 379 396 624 525
Interest income recognized 0 [1] 0 [1] 0 [1] 0 [1] 0 [1]
Total impaired loans [Abstract]          
Recorded balance 17,286 16,389 17,286 16,389 15,169
Unpaid Contractual Principal Balance 18,990 20,237 18,990 20,237 16,888
Specific Allowance 84 83 84 83 102
Average investment in impaired loans 17,715 16,204 16,239 16,254 15,921
Interest Income Recognized 257 [1] 151 [1] 371 [1] 305 [1] 568 [1]
Real Estate Mortgage [Member]
          
Loans without a specific valuation allowance [Abstract]          
Recorded Balance 1,865 1,027 1,865 1,027 1,024
Unpaid Contractual Principal Balance 1,865 1,027 1,865 1,027 1,024
Specific Allowance 0 0 0 0 0
Average Investment in Impaired Loans 1,866 1,025 1,445 842 934
Interest Income Recognized 22 [1] 17 [1] 32 [1] 24 [1] 43 [1]
Total impaired loans [Abstract]          
Recorded balance 1,865 1,027 1,865 1,027 1,024
Unpaid Contractual Principal Balance 1,865 1,027 1,865 1,027 1,024
Specific Allowance 0 0 0 0 0
Average investment in impaired loans 1,866 1,025 1,445 842 934
Interest Income Recognized $ 22 [1] $ 17 [1] $ 32 [1] $ 24 [1] $ 43 [1]
[1] Cash basis interest is substantially the same as interest income recognized.