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Loans Impaired Loans by Class (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | $ 47,376 | $ 41,133 | $ 45,744
Unpaid Principal Balance | 51,532 | 41,133 | 49,542
Related Allowance | 3,105 | 2,348 | 3,539
Average Recorded Investment | 47,322 | 41,595 | 45,019
Recognized Interest Income | 396 | 165 | 1,039
With No Related Allowance Recorded [Member] |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 29,979 | 26,701 | 28,282
Unpaid Principal Balance | 33,286 | 26,701 | 31,303
Related Allowance | 0 | 0 | 0
Average Recorded Investment | 28,462 | 25,916 | 26,837
Recognized Interest Income | 235 | 91 | 468
With an Allowance Recorded [Member] |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 17,397 | 14,432 | 17,462
Unpaid Principal Balance | 18,246 | 14,432 | 18,239
Related Allowance | 3,105 | 2,348 | 3,539
Average Recorded Investment | 18,860 | 15,679 | 18,182
Recognized Interest Income | 161 | 74 | 571
Commercial Real Estate [Member] |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 17,534 | 14,295 | 15,774
Unpaid Principal Balance | 18,685 | 14,295 | 16,981
Related Allowance | 1,473 | 944 | 1,523
Average Recorded Investment | 16,954 | 12,723 | 14,716
Recognized Interest Income | 163 | 50 | 410
Commercial Real Estate [Member] | With No Related Allowance Recorded [Member] |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 11,010 | 10,704 | 9,386
Unpaid Principal Balance | 11,468 | 10,704 | 9,963
Related Allowance | 0 | 0 | 0
Average Recorded Investment | 10,154 | 8,445 | 10,102
Recognized Interest Income | 101 | 40 | 199
Commercial Real Estate [Member] | With an Allowance Recorded [Member] |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 6,524 | 3,591 | 6,388
Unpaid Principal Balance | 7,217 | 3,591 | 7,018
Related Allowance | 1,473 | 944 | 1,523
Average Recorded Investment | 6,800 | 4,278 | 4,614
Recognized Interest Income | 62 | 10 | 211
Commercial Real Estate Construction Financing Receivable [Member] |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 2,347 | 2,093 | 3,354
Unpaid Principal Balance | 2,367 | 2,093 | 3,368
Related Allowance | 760 | 117 | 969
Average Recorded Investment | 3,018 | 3,580 | 4,349
Recognized Interest Income | 27 | 13 | 85
Commercial Real Estate Construction Financing Receivable [Member] | With No Related Allowance Recorded [Member] |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 95 | 1,362 | 101
Unpaid Principal Balance | 115 | 1,362 | 115
Related Allowance | 0 | 0 | 0
Average Recorded Investment | 43 | 2,983 | 2,533
Recognized Interest Income | 1 | 13 | 0
Commercial Real Estate Construction Financing Receivable [Member] | With an Allowance Recorded [Member] |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 2,252 | 731 | 3,253
Unpaid Principal Balance | 2,252 | 731 | 3,253
Related Allowance | 760 | 117 | 969
Average Recorded Investment | 2,975 | 597 | 1,816
Recognized Interest Income | 26 | 0 | 85
Commercial Other [Member] |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 5,550 | 3,886 | 5,861
Unpaid Principal Balance | 6,306 | 3,886 | 6,471
Related Allowance | 535 | 480 | 652
Average Recorded Investment | 5,792 | 5,204 | 4,851
Recognized Interest Income | 36 | 13 | 91
Commercial Other [Member] | With No Related Allowance Recorded [Member] |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 3,580 | 2,811 | 4,737
Unpaid Principal Balance | 4,315 | 2,811 | 5,345
Related Allowance | 0 | 0 | 0
Average Recorded Investment | 3,695 | 2,981 | 2,877
Recognized Interest Income | 27 | 8 | 53
Commercial Other [Member] | With an Allowance Recorded [Member] |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 1,970 | 1,075 | 1,124
Unpaid Principal Balance | 1,991 | 1,075 | 1,126
Related Allowance | 535 | 480 | 652
Average Recorded Investment | 2,097 | 2,223 | 1,974
Recognized Interest Income | 9 | 5 | 38
Residential Term [Member] |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 20,262 | 18,054 | 19,444
Unpaid Principal Balance | 22,262 | 18,054 | 21,282
Related Allowance | 337 | 592 | 395
Average Recorded Investment | 19,892 | 17,450 | 18,867
Recognized Interest Income | 162 | 89 | 426
Residential Term [Member] | With No Related Allowance Recorded [Member] |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 13,611 | 9,930 | 12,747
Unpaid Principal Balance | 15,476 | 9,930 | 14,440
Related Allowance | 0 | 0 | 0
Average Recorded Investment | 13,078 | 10,001 | 9,801
Recognized Interest Income | 98 | 30 | 189
Residential Term [Member] | With an Allowance Recorded [Member] |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 6,651 | 8,124 | 6,697
Unpaid Principal Balance | 6,786 | 8,124 | 6,842
Related Allowance | 337 | 592 | 395
Average Recorded Investment | 6,814 | 7,449 | 9,066
Recognized Interest Income | 64 | 59 | 237
Residential Construction [Member] |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 0 | 1,454 | 0
Unpaid Principal Balance | 0 | 1,454 | 0
Related Allowance | 0 | 49 | 0
Average Recorded Investment | 0 | 1,316 | 821
Recognized Interest Income | 0 | 0 | 0
Residential Construction [Member] | With No Related Allowance Recorded [Member] |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 0 | 1,120 | 0
Unpaid Principal Balance | 0 | 1,120 | 0
Related Allowance | 0 | 0 | 0
Average Recorded Investment | 0 | 718 | 560
Recognized Interest Income | 0 | 0 | 0
Residential Construction [Member] | With an Allowance Recorded [Member] |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 0 | 334 | 0
Unpaid Principal Balance | 0 | 334 | 0
Related Allowance | 0 | 49 | 0
Average Recorded Investment | 0 | 598 | 261
Recognized Interest Income | 0 | 0 | 0
Home Equity [Member] |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 1,683 | 1,336 | 1,311
Unpaid Principal Balance | 1,912 | 1,336 | 1,440
Related Allowance | 0 | 156 | 0
Average Recorded Investment | 1,666 | 1,295 | 1,403
Recognized Interest Income | 8 | 0 | 27
Home Equity [Member] | With No Related Allowance Recorded [Member] |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 1,683 | 774 | 1,311
Unpaid Principal Balance | 1,912 | 774 | 1,440
Related Allowance | 0 | 0 | 0
Average Recorded Investment | 1,492 | 776 | 961
Recognized Interest Income | 8 | 0 | 27
Home Equity [Member] | With an Allowance Recorded [Member] |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 0 | 562 | 0
Unpaid Principal Balance | 0 | 562 | 0
Related Allowance | 0 | 156 | 0
Average Recorded Investment | 174 | 519 | 442
Recognized Interest Income | 0 | 0 | 0
Consumer Loan [Member] |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 0 | 15 | 0
Unpaid Principal Balance | 0 | 15 | 0
Related Allowance | 0 | 10 | 0
Average Recorded Investment | 0 | 27 | 12
Recognized Interest Income | 0 | 0 | 0
Consumer Loan [Member] | With No Related Allowance Recorded [Member] |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 0 | 0 | 0
Unpaid Principal Balance | 0 | 0 | 0
Related Allowance | 0 | 0 | 0
Average Recorded Investment | 0 | 12 | 3
Recognized Interest Income | 0 | 0 | 0
Consumer Loan [Member] | With an Allowance Recorded [Member] |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 0 | 15 | 0
Unpaid Principal Balance | 0 | 15 | 0
Related Allowance | 0 | 10 | 0
Average Recorded Investment | 0 | 15 | 9
Recognized Interest Income | $ 0 | $ 0 | $ 0

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