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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance | $ 62,262 | $ 60,732 | $ 67,187 | $ 61,234 |
Charge-offs | (16,136) | (3,749) | (26,612) | (8,741) |
Recoveries | 526 | 396 | 1,580 | 1,099 |
Provision for Loan, Lease, and Other Losses | 10,800 | 4,297 | 15,297 | 8,084 |
Ending Balance | 57,452 | 61,676 | 57,452 | 61,676 |
Ending balance: individually evaluated for impaired | 9,655 | 11,734 | 9,655 | 11,734 |
Ending balance: collectively evaluated for impaired | 47,797 | 49,942 | 47,797 | 49,942 |
Total | 4,229,752 | 4,159,531 | 4,229,752 | 4,159,531 | 4,204,704
Ending balance: individually evaluated for impaired | 66,826 | 80,590 | 66,826 | 80,590 |
Ending balance: collectively evaluated for impaired | 4,162,926 | 4,078,941 | 4,162,926 | 4,078,941 |
Commercial Loan [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance | 20,275 | 18,143 | 19,852 | 18,200 |
Charge-offs | (13,683) | (1,754) | (14,221) | (3,668) |
Recoveries | 136 | 37 | 264 | 275 |
Provision for Loan, Lease, and Other Losses | 9,847 | 2,876 | 10,680 | 4,495 |
Ending Balance | 16,575 | 19,302 | 16,575 | 19,302 |
Ending balance: individually evaluated for impaired | 6,627 | 8,046 | 6,627 | 8,046 |
Ending balance: collectively evaluated for impaired | 9,948 | 11,256 | 9,948 | 11,256 |
Total | 1,012,315 | 1,059,675 | 1,012,315 | 1,059,675 | 1,019,822
Ending balance: individually evaluated for impaired | 24,592 | 31,271 | 24,592 | 31,271 |
Ending balance: collectively evaluated for impaired | 987,723 | 1,028,404 | 987,723 | 1,028,404 |
Construction Loans [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance | 7,733 | 6,427 | 8,928 | 6,756 |
Charge-offs | (671) | (150) | (755) | (340) |
Recoveries | 47 | 36 | 59 | 92 |
Provision for Loan, Lease, and Other Losses | 1,137 | 1,688 | 14 | 1,493 |
Ending Balance | 8,246 | 8,001 | 8,246 | 8,001 |
Ending balance: individually evaluated for impaired | 267 | 2,747 | 267 | 2,747 |
Ending balance: collectively evaluated for impaired | 7,979 | 5,254 | 7,979 | 5,254 |
Total | 66,243 | 77,442 | 66,243 | 77,442 | 87,438
Ending balance: individually evaluated for impaired | 3,904 | 14,915 | 3,904 | 14,915 |
Ending balance: collectively evaluated for impaired | 62,339 | 62,527 | 62,339 | 62,527 |
Residential Portfolio Segment [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance | 5,749 | 6,702 | 5,908 | 8,237 |
Charge-offs | (321) | (742) | (643) | (2,454) |
Recoveries | 89 | 149 | 812 | 282 |
Provision for Loan, Lease, and Other Losses | 922 | 510 | 362 | 554 |
Ending Balance | 6,439 | 6,619 | 6,439 | 6,619 |
Ending balance: individually evaluated for impaired | 1,943 | 431 | 1,943 | 431 |
Ending balance: collectively evaluated for impaired | 4,496 | 6,188 | 4,496 | 6,188 |
Total | 1,269,830 | 1,213,610 | 1,269,830 | 1,213,610 | 1,241,565
Ending balance: individually evaluated for impaired | 10,468 | 2,911 | 10,468 | 2,911 |
Ending balance: collectively evaluated for impaired | 1,259,362 | 1,210,699 | 1,259,362 | 1,210,699 |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance | 18,470 | 19,371 | 22,441 | 18,961 |
Charge-offs | (694) | (306) | (9,238) | (541) |
Recoveries | 11 | 28 | 108 | 186 |
Provision for Loan, Lease, and Other Losses | (1,659) | (1,455) | 2,817 | (968) |
Ending Balance | 16,128 | 17,638 | 16,128 | 17,638 |
Ending balance: individually evaluated for impaired | 818 | 510 | 818 | 510 |
Ending balance: collectively evaluated for impaired | 15,310 | 17,128 | 15,310 | 17,128 |
Total | 1,280,784 | 1,232,270 | 1,280,784 | 1,232,270 | 1,273,661
Ending balance: individually evaluated for impaired | 27,862 | 31,493 | 27,862 | 31,493 |
Ending balance: collectively evaluated for impaired | 1,252,922 | 1,200,777 | 1,252,922 | 1,200,777 |
Consumer Loan [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance | 4,139 | 4,252 | 4,132 | 4,244 |
Charge-offs | (767) | (797) | (1,755) | (1,738) |
Recoveries | 243 | 146 | 337 | 264 |
Provision for Loan, Lease, and Other Losses | 527 | 608 | 1,428 | 1,439 |
Ending Balance | 4,142 | 4,209 | 4,142 | 4,209 |
Ending balance: individually evaluated for impaired | 0 | 0 | 0 | 0 |
Ending balance: collectively evaluated for impaired | 4,142 | 4,209 | 4,142 | 4,209 |
Total | 600,580 | 576,534 | 600,580 | 576,534 | 582,218
Ending balance: individually evaluated for impaired | 0 | 0 | 0 | 0 |
Ending balance: collectively evaluated for impaired | 600,580 | 576,534 | 600,580 | 576,534 |
Unallocated [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance | 5,896 | 5,837 | 5,926 | 4,836 |
Charge-offs | 0 | 0 | 0 | 0 |
Recoveries | 0 | 0 | 0 | 0 |
Provision for Loan, Lease, and Other Losses | 26 | 70 | (4) | 1,071 |
Ending Balance | 5,922 | 5,907 | 5,922 | 5,907 |
Ending balance: individually evaluated for impaired | 0 | 0 | 0 | 0 |
Ending balance: collectively evaluated for impaired | $ 5,922 | $ 5,907 | $ 5,922 | $ 5,907 |

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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 Amount of recovery of financing receivables doubtful of collection that were previously charged off. + 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=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 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 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 2: 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 3: 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. Reference 4: 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 5: 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. + Details
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- Definition The sum of the periodic provision charged to earnings, based on an assessment of uncollectibility from the counterparty on account of loan, lease or other credit losses, to reduce these accounts to the amount that approximates their net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 Reference 5: 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=7512638&loc=SL6953423-111524 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Paragraph 168, 169, 170 -IssueDate 2006-05-01 -Chapter 5 -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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