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Loans and Leases - Allowance for Loan and Lease Losses by Portfolio Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | $ 32,429 |  |  |  |  | $ 32,429 |  |
Loan and lease loss provision (income) | $ 220 | $ 269 | $ 422 | (80) | $ 151 | $ (1,450) | $ (1,515) | $ (1,525) | 831 | $ (4,339) | $ (11,614)
Balance at end of period | 31,043 |  |  |  | 32,429 |  |  |  | 31,043 | 32,429 |
Loans receivable: |  |  |  |  |  |  |  |  |  |  |
Balance at end of period | 4,304,458 |  |  |  | 3,844,769 |  |  |  | 4,304,458 | 3,844,769 |
PCI Loans [Member] |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 971 |  |  |  | 5,441 | 971 | 5,441 |
Charge-offs |  |  |  |  |  |  |  |  |  | (5,133) |
Loan and lease loss provision (income) |  |  |  |  |  |  |  |  | (651) | 663 |
Balance at end of period | 320 |  |  |  | 971 |  |  |  | 320 | 971 | 5,441
Loans receivable: |  |  |  |  |  |  |  |  |  |  |
Balance at end of period | 7,748 |  |  |  | 9,863 |  |  |  | 7,748 | 9,863 |
PCI Loans [Member] | Real estate loans [Member] |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 922 |  |  |  | 5,397 | 922 | 5,397 |
Charge-offs |  |  |  |  |  |  |  |  |  | (5,133) |
Loan and lease loss provision (income) |  |  |  |  |  |  |  |  | (663) | 658 |
Balance at end of period | 259 |  |  |  | 922 |  |  |  | 259 | 922 | 5,397
Loans receivable: |  |  |  |  |  |  |  |  |  |  |
Balance at end of period | 7,659 |  |  |  | 9,677 |  |  |  | 7,659 | 9,677 |
PCI Loans [Member] | Commercial and industrial loans[Member] |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 41 |  |  |  | 42 | 41 | 42 |
Charge-offs |  |  |  |  |  |  |  |  |  | 0 |
Loan and lease loss provision (income) |  |  |  |  |  |  |  |  | 0 | (1) |
Balance at end of period | 41 |  |  |  | 41 |  |  |  | 41 | 41 | 42
Loans receivable: |  |  |  |  |  |  |  |  |  |  |
Balance at end of period | 49 |  |  |  | 136 |  |  |  | 49 | 136 |
PCI Loans [Member] | Leases Receivable [Member] |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 0 |  |  |  | 0 | 0 | 0 |
Charge-offs |  |  |  |  |  |  |  |  |  | 0 |
Loan and lease loss provision (income) |  |  |  |  |  |  |  |  | 0 | 0 |
Balance at end of period | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Loans receivable: |  |  |  |  |  |  |  |  |  |  |
Balance at end of period | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
PCI Loans [Member] | Consumer loans [Member] |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 8 |  |  |  | 2 | 8 | 2 |
Charge-offs |  |  |  |  |  |  |  |  |  | 0 |
Loan and lease loss provision (income) |  |  |  |  |  |  |  |  | 12 | 6 |
Balance at end of period | 20 |  |  |  | 8 |  |  |  | 20 | 8 | 2
Loans receivable: |  |  |  |  |  |  |  |  |  |  |
Balance at end of period | 40 |  |  |  | 50 |  |  |  | 40 | 50 |
PCI Loans [Member] | Unallocated [Member] |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 0 |  |  |  | 0 | 0 | 0 |
Charge-offs |  |  |  |  |  |  |  |  |  | 0 |
Loan and lease loss provision (income) |  |  |  |  |  |  |  |  | 0 | 0 |
Balance at end of period | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Loans receivable: |  |  |  |  |  |  |  |  |  |  |
Balance at end of period | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Non-PCI Loans [Member] |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 31,458 |  |  |  | 37,494 | 31,458 | 37,494 |
Charge-offs |  |  |  |  |  |  |  |  | (5,899) | (3,736) |
Recoveries on loans and leases previously charged off |  |  |  |  |  |  |  |  | 3,682 | 2,702 |
Loan and lease loss provision (income) |  |  |  |  |  |  |  |  | 1,482 | (5,002) |
Balance at end of period | 30,723 |  |  |  | 31,458 |  |  |  | 30,723 | 31,458 | 37,494
Ending balance: individually evaluated for impairment | 5,878 |  |  |  | 4,327 |  |  |  | 5,878 | 4,327 |
Ending balance: collectively evaluated for impairment | 24,845 |  |  |  | 27,131 |  |  |  | 24,845 | 27,131 |
Loans receivable: |  |  |  |  |  |  |  |  |  |  |
Ending balance: individually evaluated for impairment | 27,184 |  |  |  | 26,350 |  |  |  | 27,184 | 26,350 |
Ending balance: collectively evaluated for impairment | 4,269,526 |  |  |  | 3,808,556 |  |  |  | 4,269,526 | 3,808,556 |
Balance at end of period | 4,296,710 |  |  |  | 3,834,906 |  |  |  | 4,296,710 | 3,834,906 |
Non-PCI Loans [Member] | Real estate loans [Member] |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 25,212 |  |  |  | 29,800 | 25,212 | 29,800 |
Charge-offs |  |  |  |  |  |  |  |  | (2,150) | (3,022) |
Recoveries on loans and leases previously charged off |  |  |  |  |  |  |  |  | 1,527 | 667 |
Loan and lease loss provision (income) |  |  |  |  |  |  |  |  | (7,836) | (2,233) |
Balance at end of period | 16,753 |  |  |  | 25,212 |  |  |  | 16,753 | 25,212 | 29,800
Ending balance: individually evaluated for impairment | 2,093 |  |  |  | 3,980 |  |  |  | 2,093 | 3,980 |
Ending balance: collectively evaluated for impairment | 14,660 |  |  |  | 21,232 |  |  |  | 14,660 | 21,232 |
Loans receivable: |  |  |  |  |  |  |  |  |  |  |
Ending balance: individually evaluated for impairment | 18,663 |  |  |  | 21,757 |  |  |  | 18,663 | 21,757 |
Ending balance: collectively evaluated for impairment | 3,564,592 |  |  |  | 3,246,941 |  |  |  | 3,564,592 | 3,246,941 |
Balance at end of period | 3,583,255 |  |  |  | 3,268,698 |  |  |  | 3,583,255 | 3,268,698 |
Non-PCI Loans [Member] | Commercial and industrial loans[Member] |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 5,582 |  |  |  | 7,081 | 5,582 | 7,081 |
Charge-offs |  |  |  |  |  |  |  |  | (2,516) | (706) |
Recoveries on loans and leases previously charged off |  |  |  |  |  |  |  |  | 1,901 | 1,978 |
Loan and lease loss provision (income) |  |  |  |  |  |  |  |  | 2,392 | (2,771) |
Balance at end of period | 7,359 |  |  |  | 5,582 |  |  |  | 7,359 | 5,582 | 7,081
Ending balance: individually evaluated for impairment | 441 |  |  |  | 347 |  |  |  | 441 | 347 |
Ending balance: collectively evaluated for impairment | 6,918 |  |  |  | 5,235 |  |  |  | 6,918 | 5,235 |
Loans receivable: |  |  |  |  |  |  |  |  |  |  |
Ending balance: individually evaluated for impairment | 3,040 |  |  |  | 4,174 |  |  |  | 3,040 | 4,174 |
Ending balance: collectively evaluated for impairment | 396,112 |  |  |  | 295,910 |  |  |  | 396,112 | 295,910 |
Balance at end of period | 399,152 |  |  |  | 300,084 |  |  |  | 399,152 | 300,084 |
Non-PCI Loans [Member] | Leases Receivable [Member] |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 307 |  |  |  | 0 | 307 | 0 |
Charge-offs |  |  |  |  |  |  |  |  | (1,233) | (6) |
Recoveries on loans and leases previously charged off |  |  |  |  |  |  |  |  | 239 | 1 |
Loan and lease loss provision (income) |  |  |  |  |  |  |  |  | 6,966 | 312 |
Balance at end of period | 6,279 |  |  |  | 307 |  |  |  | 6,279 | 307 | 0
Ending balance: individually evaluated for impairment | 3,334 |  |  |  | 0 |  |  |  | 3,334 | 0 |
Ending balance: collectively evaluated for impairment | 2,945 |  |  |  | 307 |  |  |  | 2,945 | 307 |
Loans receivable: |  |  |  |  |  |  |  |  |  |  |
Ending balance: individually evaluated for impairment | 4,452 |  |  |  | 0 |  |  |  | 4,452 | 0 |
Ending balance: collectively evaluated for impairment | 292,832 |  |  |  | 243,294 |  |  |  | 292,832 | 243,294 |
Balance at end of period | 297,284 |  |  |  | 243,294 |  |  |  | 297,284 | 243,294 |
Non-PCI Loans [Member] | Consumer loans [Member] |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 191 |  |  |  | 242 | 191 | 242 |
Charge-offs |  |  |  |  |  |  |  |  | 0 | (2) |
Recoveries on loans and leases previously charged off |  |  |  |  |  |  |  |  | 15 | 56 |
Loan and lease loss provision (income) |  |  |  |  |  |  |  |  | (104) | (105) |
Balance at end of period | 102 |  |  |  | 191 |  |  |  | 102 | 191 | 242
Ending balance: individually evaluated for impairment | 10 |  |  |  | 0 |  |  |  | 10 | 0 |
Ending balance: collectively evaluated for impairment | 92 |  |  |  | 191 |  |  |  | 92 | 191 |
Loans receivable: |  |  |  |  |  |  |  |  |  |  |
Ending balance: individually evaluated for impairment | 1,029 |  |  |  | 419 |  |  |  | 1,029 | 419 |
Ending balance: collectively evaluated for impairment | 15,990 |  |  |  | 22,411 |  |  |  | 15,990 | 22,411 |
Balance at end of period | 17,019 |  |  |  | 22,830 |  |  |  | 17,019 | 22,830 |
Non-PCI Loans [Member] | Unallocated [Member] |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | $ 166 |  |  |  | $ 371 | 166 | 371 |
Charge-offs |  |  |  |  |  |  |  |  | 0 | 0 |
Recoveries on loans and leases previously charged off |  |  |  |  |  |  |  |  | 0 | 0 |
Loan and lease loss provision (income) |  |  |  |  |  |  |  |  | 64 | (205) |
Balance at end of period | 230 |  |  |  | 166 |  |  |  | 230 | 166 | $ 371
Ending balance: individually evaluated for impairment | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Ending balance: collectively evaluated for impairment | 230 |  |  |  | 166 |  |  |  | 230 | 166 |
Loans receivable: |  |  |  |  |  |  |  |  |  |  |
Ending balance: individually evaluated for impairment | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Ending balance: collectively evaluated for impairment | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Balance at end of period | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 | $ 0 |

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- Definition Provision (Negative Provision) For Loan, Lease, And Other Losses + References No definition available. + 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=84173941&loc=SL6953423-111524 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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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 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 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 + 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=84173941&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 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: 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=84173941&loc=SL6953423-111524 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 FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 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=82894903&loc=d3e15032-111544 + Details
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