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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

X
- Definition Reflects the gross amount charged against earnings during the period as credit losses (bad debt expense) based on review of the loan and lease portfolio and application of the methodology for estimating credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 114 -Paragraph 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 + Details
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- Definition Reflects a reduction in bad debt expense attributable to collections of loans and lease receivables which had previously been fully or partially charged off as bad debts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 114 -Paragraph 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 + Details
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- Definition Reflects the amount of loans and leases that have been removed, or charged off, from both loan receivables and the reserve for credit losses, typically because they are considered to be not salvageable or have been purchased by unconsolidated collection entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 114 -Paragraph 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 8, 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Section 563c.102 -Paragraph 8 -Subparagraph a(ii) -Chapter V -Subsection I -LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 114 -Paragraph 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Section 563c.102 -Paragraph 8 -Subparagraph e -Chapter V -Subsection I -LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Paragraph 116 -IssueDate 2006-05-01 -Chapter 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5074-111524 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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