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Loans Receivable and Allowance for Loan Losses - Activity in Allowance for Loan Losses (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Balance, beginning of period | $ 20,425 | $ 20,098 | $ 20,965 | $ 23,166
Provision for loan losses | (2,900) | 0 | (2,900) | (1,400)
Charge-offs | (2,238) | (1,815) | (3,340) | (5,059)
Recoveries | 732 | 2,969 | 1,294 | 4,545
Balance, end of period | 16,019 | 21,252 | 16,019 | 21,252
Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Balance, beginning of period | 14,053 | 11,288 | 13,215 | 13,719
Provision for loan losses | (2,593) | 3,495 | (1,210) | 3,653
Charge-offs | (1,840) | (1,767) | (2,514) | (4,444)
Recoveries | 382 | 45 | 511 | 133
Balance, end of period | 10,002 | 13,061 | 10,002 | 13,061
Acquisition and Development [Member] |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Balance, beginning of period | 852 | 1,946 | 670 | 3,502
Provision for loan losses | (284) | (1,117) | (73) | (3,943)
Charge-offs | (33) | (2) | (67) | (146)
Recoveries | 0 | 267 | 5 | 1,681
Balance, end of period | 535 | 1,094 | 535 | 1,094
Commercial and Industrial [Member] |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Balance, beginning of period | 993 | 875 | 864 | 1,635
Provision for loan losses | (387) | (2,651) | (552) | (3,309)
Charge-offs | (1) | 0 | (64) | (114)
Recoveries | 317 | 2,530 | 674 | 2,542
Balance, end of period | 922 | 754 | 922 | 754
Municipal [Member] |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Balance, beginning of period | 178 | 254 | 244 | 223
Provision for loan losses | 9 | (12) | (57) | 19
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0
Balance, end of period | 187 | 242 | 187 | 242
Commercial [Member] |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Balance, beginning of period | 16,076 | 14,363 | 14,993 | 19,079
Provision for loan losses | (3,255) | (285) | (1,892) | (3,580)
Charge-offs | (1,874) | (1,769) | (2,645) | (4,704)
Recoveries | 699 | 2,842 | 1,190 | 4,356
Balance, end of period | 11,646 | 15,151 | 11,646 | 15,151
Residential Mortgage [Member] |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Balance, beginning of period | 2,362 | 3,796 | 3,780 | 2,275
Provision for loan losses | 72 | 2 | (1,150) | 1,750
Charge-offs | (286) | 0 | (495) | (263)
Recoveries | 6 | 100 | 19 | 136
Balance, end of period | 2,154 | 3,898 | 2,154 | 3,898
Installment and Other Loans [Member] |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Balance, beginning of period | 186 | 134 | 124 | 85
Provision for loan losses | 66 | 11 | 192 | 80
Charge-offs | (78) | (46) | (200) | (92)
Recoveries | 27 | 27 | 85 | 53
Balance, end of period | 201 | 126 | 201 | 126
Consumer [Member] |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Balance, beginning of period | 2,548 | 3,930 | 3,904 | 2,360
Provision for loan losses | 138 | 13 | (958) | 1,830
Charge-offs | (364) | (46) | (695) | (355)
Recoveries | 33 | 127 | 104 | 189
Balance, end of period | 2,355 | 4,024 | 2,355 | 4,024
Unallocated [Member] |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Balance, beginning of period | 1,801 | 1,805 | 2,068 | 1,727
Provision for loan losses | 217 | 272 | (50) | 350
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0
Balance, end of period | $ 2,018 | $ 2,077 | $ 2,018 | $ 2,077

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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: 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 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + 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 (c)(4) -URI http://asc.fasb.org/extlink&oid=35738203&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 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 2: 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 3: 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=35738203&loc=SL6953423-111524 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 Reference 5: 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 6: 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 of expense related to estimated loss from loan and lease transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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