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Allowance for Loan Losses Allowance for Loan Loss Activity by Class (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance $ 12,500 $ 13,000 $ 13,000
Charge offs 1,434 2,470 9,080
Recoveries 154 324 745
Provision 1,500 2,100 7,835
Ending balance 12,720 12,954 12,500
Ending balance specifically evaluated for impairment 3,105 2,348 3,539
Ending balance collectively evaluated for impairment 9,615 10,606 8,961
Total 863,477 870,892 869,284
Ending balance specifically evaluated for impairment 47,376 41,133 45,744
Ending balance collectively evaluated for impairment 816,101 829,759 823,540
Commercial Real Estate Portfolio Segment [Member]
      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 5,865 5,659 5,659
Charge offs 54 0 1,394
Recoveries 0 0 13
Provision 68 203 1,587
Ending balance 5,879 5,862 5,865
Ending balance specifically evaluated for impairment 1,473 944 1,523
Ending balance collectively evaluated for impairment 4,406 4,918 4,342
Total 250,180 254,708 251,335
Ending balance specifically evaluated for impairment 17,534 14,295 15,774
Ending balance collectively evaluated for impairment 232,646 240,413 235,561
Commercial Construction [Member]
      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 1,359 658 658
Charge offs 403 0 928
Recoveries 0 246 246
Provision 108 (200) 1,383
Ending balance 1,064 704 1,359
Ending balance specifically evaluated for impairment 760 117 969
Ending balance collectively evaluated for impairment 304 587 390
Total 17,090 30,828 22,417
Ending balance specifically evaluated for impairment 2,347 2,093 3,354
Ending balance collectively evaluated for impairment 14,743 28,735 19,063
Commercial Other [Member]
      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 2,050 2,063 2,063
Charge offs 288 2,002 3,215
Recoveries 103 2 113
Provision 250 2,062 3,089
Ending balance 2,115 2,125 2,050
Ending balance specifically evaluated for impairment 535 480 652
Ending balance collectively evaluated for impairment 1,580 1,645 1,398
Total 89,874 85,467 81,183
Ending balance specifically evaluated for impairment 5,550 3,886 5,861
Ending balance collectively evaluated for impairment 84,324 81,581 75,322
Municipal [Member]
      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 18 19 19
Charge offs 0 0 0
Recoveries 0 0 0
Provision 0 0 (1)
Ending balance 18 19 18
Ending balance specifically evaluated for impairment 0 0 0
Ending balance collectively evaluated for impairment 18 19 18
Total 15,017 15,961 14,704
Ending balance specifically evaluated for impairment 0 0 0
Ending balance collectively evaluated for impairment 15,017 15,961 14,704
Residential Term [Member]
      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 1,109 1,159 1,159
Charge offs 200 239 1,911
Recoveries 2 1 110
Provision 202 315 1,751
Ending balance 1,113 1,236 1,109
Ending balance specifically evaluated for impairment 337 592 395
Ending balance collectively evaluated for impairment 776 644 714
Total 376,029 358,394 379,447
Ending balance specifically evaluated for impairment 20,262 18,054 19,444
Ending balance collectively evaluated for impairment 355,767 340,340 360,003
Residential Construction [Member]
      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 11 255 255
Charge offs 0 0 389
Recoveries 0 0 54
Provision (2) (196) 91
Ending balance 9 59 11
Ending balance specifically evaluated for impairment 0 49 0
Ending balance collectively evaluated for impairment 9 10 11
Total 4,222 6,451 6,459
Ending balance specifically evaluated for impairment 0 1,454 0
Ending balance collectively evaluated for impairment 4,222 4,997 6,459
Home Equity [Member]
      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 654 595 595
Charge offs 362 49 688
Recoveries 1 0 1
Provision 566 136 746
Ending balance 859 682 654
Ending balance specifically evaluated for impairment 0 156 0
Ending balance collectively evaluated for impairment 859 526 654
Total 96,536 103,372 99,082
Ending balance specifically evaluated for impairment 1,683 1,336 1,311
Ending balance collectively evaluated for impairment 94,853 102,036 97,771
Consumer Portfolio Segment [Member]
      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 592 584 584
Charge offs 127 180 555
Recoveries 48 75 208
Provision 61 89 355
Ending balance 574 568 592
Ending balance specifically evaluated for impairment 0 10 0
Ending balance collectively evaluated for impairment 574 558 592
Total 14,529 15,711 14,657
Ending balance specifically evaluated for impairment 0 15 0
Ending balance collectively evaluated for impairment 14,529 15,696 14,657
Unallocated Financing Receivables [Member]
      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 842 2,008 2,008
Charge offs 0 0 0
Recoveries 0 0 0
Provision 247 (309) (1,166)
Ending balance 1,089 1,699 842
Ending balance specifically evaluated for impairment 0 0 0
Ending balance collectively evaluated for impairment 1,089 1,699 842
Total 0 0 0
Ending balance specifically evaluated for impairment 0 0 0
Ending balance collectively evaluated for impairment $ 0 $ 0 $ 0