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Loans and Allowance for Loan Losses - Activity in ALLL by Class of Loans (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
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Beginning Balance | $ 38,664 | $ 37,633 | $ 38,725 | $ 37,656 |
Charge-offs | (347) | (531) | (880) | (1,063) |
Recoveries | 149 | 86 | 321 | 422 |
Net charge-offs | (198) | (445) | (559) | (641) |
Provisions charged to operations | 516 | 248 | 816 | 421 |
Ending balance | 38,982 | 37,436 | 38,982 | 37,436 |
Individually evaluated for impairment | 6,516 | 7,680 | 6,516 | 7,680 |
Collectively evaluated for impairment | 32,466 | 29,756 | 32,466 | 29,756 |
Individually evaluated for impairment | 61,659 | 69,929 | 61,659 | 69,929 |
Collectively evaluated for impairment | 3,176,974 | 2,983,606 | 3,176,974 | 2,983,606 |
Loans acquired with deteriorated credit quality | 6,451 | 11,904 | 6,451 | 11,904 |
Ending balance | 3,245,084 | 3,065,439 | 3,245,084 | 3,065,439 | 3,242,427
Non-residential real estate [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Beginning Balance | 15,331 | 14,109 | 14,969 | 13,948 |
Charge-offs | (3) | (7) | (21) | (128) |
Recoveries | 7 | (6) | 26 | 31 |
Net charge-offs | 4 | (13) | 5 | (97) |
Provisions charged to operations | 245 | 253 | 606 | 498 |
Ending balance | 15,580 | 14,349 | 15,580 | 14,349 |
Individually evaluated for impairment | 2,880 | 2,986 | 2,880 | 2,986 |
Collectively evaluated for impairment | 12,700 | 11,363 | 12,700 | 11,363 |
Individually evaluated for impairment | 35,568 | 38,278 | 35,568 | 38,278 |
Collectively evaluated for impairment | 1,215,756 | 1,102,773 | 1,215,756 | 1,102,773 |
Loans acquired with deteriorated credit quality |  |  |  |  |
Ending balance | 1,251,324 | 1,141,051 | 1,251,324 | 1,141,051 |
Residential real estate [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Beginning Balance | 9,921 | 9,762 | 9,815 | 9,764 |
Charge-offs | (99) | (95) | (250) | (131) |
Recoveries | 29 | 13 | 42 | 109 |
Net charge-offs | (70) | (82) | (208) | (22) |
Provisions charged to operations | 231 | 326 | 475 | 264 |
Ending balance | 10,082 | 10,006 | 10,082 | 10,006 |
Individually evaluated for impairment | 2,016 | 2,760 | 2,016 | 2,760 |
Collectively evaluated for impairment | 8,066 | 7,246 | 8,066 | 7,246 |
Individually evaluated for impairment | 17,531 | 20,710 | 17,531 | 20,710 |
Collectively evaluated for impairment | 775,223 | 700,439 | 775,223 | 700,439 |
Loans acquired with deteriorated credit quality |  |  |  |  |
Ending balance | 792,754 | 721,149 | 792,754 | 721,149 |
Non-consumer non-real estate [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Beginning Balance | 8,982 | 9,198 | 9,385 | 9,156 |
Charge-offs | (69) | (313) | (105) | (330) |
Recoveries | 18 | 26 | 49 | 124 |
Net charge-offs | (51) | (287) | (56) | (206) |
Provisions charged to operations | (180) | (353) | (578) | (392) |
Ending balance | 8,751 | 8,558 | 8,751 | 8,558 |
Individually evaluated for impairment | 1,124 | 1,436 | 1,124 | 1,436 |
Collectively evaluated for impairment | 7,627 | 7,122 | 7,627 | 7,122 |
Individually evaluated for impairment | 6,075 | 8,377 | 6,075 | 8,377 |
Collectively evaluated for impairment | 743,587 | 689,039 | 743,587 | 689,039 |
Loans acquired with deteriorated credit quality |  |  |  |  |
Ending balance | 749,662 | 697,416 | 749,662 | 697,416 |
Consumer non-real estate [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Beginning Balance | 2,384 | 2,283 | 2,451 | 2,315 |
Charge-offs | (155) | (77) | (295) | (191) |
Recoveries | 61 | 32 | 137 | 116 |
Net charge-offs | (94) | (45) | (158) | (75) |
Provisions charged to operations | 99 | 44 | 96 | 42 |
Ending balance | 2,389 | 2,282 | 2,389 | 2,282 |
Individually evaluated for impairment | 265 | 302 | 265 | 302 |
Collectively evaluated for impairment | 2,124 | 1,980 | 2,124 | 1,980 |
Individually evaluated for impairment | 2,205 | 2,455 | 2,205 | 2,455 |
Collectively evaluated for impairment | 215,175 | 197,972 | 215,175 | 197,972 |
Loans acquired with deteriorated credit quality |  |  |  |  |
Ending balance | 217,380 | 200,427 | 217,380 | 200,427 |
Other loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Beginning Balance | 1,822 | 1,850 | 1,885 | 1,886 |
Charge-offs | (20) | (27) | (159) | (207) |
Recoveries | 31 | 12 | 31 | 31 |
Net charge-offs | 11 | (15) | (128) | (176) |
Provisions charged to operations | 128 | 19 | 204 | 144 |
Ending balance | 1,961 | 1,854 | 1,961 | 1,854 |
Individually evaluated for impairment | 231 | 196 | 231 | 196 |
Collectively evaluated for impairment | 1,730 | 1,658 | 1,730 | 1,658 |
Individually evaluated for impairment | 280 | 109 | 280 | 109 |
Collectively evaluated for impairment | 147,225 | 155,875 | 147,225 | 155,875 |
Loans acquired with deteriorated credit quality |  |  |  |  |
Ending balance | 147,505 | 155,984 | 147,505 | 155,984 |
Acquired loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Beginning Balance | 224 | 431 | 220 | 587 |
Charge-offs | (1) | (12) | (50) | (76) |
Recoveries | 3 | 9 | 36 | 11 |
Net charge-offs | 2 | (3) | (14) | (65) |
Provisions charged to operations | (7) | (41) | 13 | (135) |
Ending balance | 219 | 387 | 219 | 387 |
Individually evaluated for impairment |  |  |  |  |
Collectively evaluated for impairment | 219 | 387 | 219 | 387 |
Individually evaluated for impairment |  |  |  |  |
Collectively evaluated for impairment | 80,008 | 137,508 | 80,008 | 137,508 |
Loans acquired with deteriorated credit quality | 6,451 | 11,904 | 6,451 | 11,904 |
Ending balance | $ 86,459 | $ 149,412 | $ 86,459 | $ 149,412 |

X
- Definition Amount of other addition (reduction) in allowance reserve for credit loss. + References Reference 1: 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=28368275&loc=d3e5212-111524 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 + Details
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- Definition The balance of financing receivables that were acquired with deteriorated credit quality. + 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=28368275&loc=SL6953423-111524 + Details
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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + 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)(1) -URI http://asc.fasb.org/extlink&oid=28368275&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=28368275&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=28368275&loc=SL6953423-111524 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. 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 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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- Definition Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + 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 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 Reference 4: 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 + Details
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