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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Allowance for loan losses on loans and leases: |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | $ 31,043 |  |  |  |  | $ 31,043 |  |
Loan and lease loss provision (income) | $ 3,041 | $ 200 | $ 100 | 649 | $ 220 | $ 269 | $ 422 | $ (80) | 3,990 | $ 831 | $ (4,339)
Balance at end of period | 31,974 |  |  |  | 31,043 |  |  |  | 31,974 | 31,043 |
Loans and leases receivable: |  |  |  |  |  |  |  |  |  |  |
Total loans and Leases | 4,600,540 |  |  |  | 4,304,458 |  |  |  | 4,600,540 | 4,304,458 |
Non-PCI Loans |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses on loans and leases: |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 31,043 |  |  |  | 32,429 | 31,043 | 32,429 |
Charge-offs |  |  |  |  |  |  |  |  | (7,310) | (5,899) |
Recoveries on loans and leases previously charged off |  |  |  |  |  |  |  |  | 4,251 | 3,682 |
Loan and lease loss provision (income) |  |  |  |  |  |  |  |  | 3,990 | 831 |
Balance at end of period | 31,974 |  |  |  | 31,043 |  |  |  | 31,974 | 31,043 | 32,429
Individually evaluated for impairment | 1,812 |  |  |  | 5,878 |  |  |  | 1,812 | 5,878 |
Collectively evaluated for impairment | 30,162 |  |  |  | 25,165 |  |  |  | 30,162 | 25,165 |
Loans and leases receivable: |  |  |  |  |  |  |  |  |  |  |
Total loans and Leases | 4,600,540 |  |  |  | 4,304,458 |  |  |  | 4,600,540 | 4,304,458 |
Individually evaluated for impairment | 25,125 |  |  |  | 27,184 |  |  |  | 25,125 | 27,184 |
Collectively evaluated for impairment | 4,575,415 |  |  |  | 4,277,274 |  |  |  | 4,575,415 | 4,277,274 |
Non-PCI Loans | Real estate loans |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses on loans and leases: |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 17,012 |  |  |  | 26,134 | 17,012 | 26,134 |
Charge-offs |  |  |  |  |  |  |  |  | (3,897) | (2,150) |
Recoveries on loans and leases previously charged off |  |  |  |  |  |  |  |  | 2,512 | 1,527 |
Loan and lease loss provision (income) |  |  |  |  |  |  |  |  | 2,757 | (8,499) |
Balance at end of period | 18,384 |  |  |  | 17,012 |  |  |  | 18,384 | 17,012 | 26,134
Individually evaluated for impairment | 1 |  |  |  | 2,093 |  |  |  | 1 | 2,093 |
Collectively evaluated for impairment | 18,383 |  |  |  | 14,919 |  |  |  | 18,383 | 14,919 |
Loans and leases receivable: |  |  |  |  |  |  |  |  |  |  |
Total loans and Leases | 3,758,355 |  |  |  | 3,590,914 |  |  |  | 3,758,355 | 3,590,914 |
Individually evaluated for impairment | 14,761 |  |  |  | 18,663 |  |  |  | 14,761 | 18,663 |
Collectively evaluated for impairment | 3,743,594 |  |  |  | 3,572,251 |  |  |  | 3,743,594 | 3,572,251 |
Non-PCI Loans | Commercial and industrial loans |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses on loans and leases: |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 7,400 |  |  |  | 5,623 | 7,400 | 5,623 |
Charge-offs |  |  |  |  |  |  |  |  | (815) | (2,516) |
Recoveries on loans and leases previously charged off |  |  |  |  |  |  |  |  | 1,369 | 1,901 |
Loan and lease loss provision (income) |  |  |  |  |  |  |  |  | (792) | 2,392 |
Balance at end of period | 7,162 |  |  |  | 7,400 |  |  |  | 7,162 | 7,400 | 5,623
Individually evaluated for impairment | 428 |  |  |  | 441 |  |  |  | 428 | 441 |
Collectively evaluated for impairment | 6,734 |  |  |  | 6,959 |  |  |  | 6,734 | 6,959 |
Loans and leases receivable: |  |  |  |  |  |  |  |  |  |  |
Total loans and Leases | 429,903 |  |  |  | 399,201 |  |  |  | 429,903 | 399,201 |
Individually evaluated for impairment | 4,396 |  |  |  | 3,040 |  |  |  | 4,396 | 3,040 |
Collectively evaluated for impairment | 425,507 |  |  |  | 396,161 |  |  |  | 425,507 | 396,161 |
Non-PCI Loans | Leases receivable |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses on loans and leases: |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 6,279 |  |  |  | 307 | 6,279 | 307 |
Charge-offs |  |  |  |  |  |  |  |  | (2,598) | (1,233) |
Recoveries on loans and leases previously charged off |  |  |  |  |  |  |  |  | 368 | 239 |
Loan and lease loss provision (income) |  |  |  |  |  |  |  |  | 2,254 | 6,966 |
Balance at end of period | 6,303 |  |  |  | 6,279 |  |  |  | 6,303 | 6,279 | 307
Individually evaluated for impairment | 1,383 |  |  |  | 3,334 |  |  |  | 1,383 | 3,334 |
Collectively evaluated for impairment | 4,920 |  |  |  | 2,945 |  |  |  | 4,920 | 2,945 |
Loans and leases receivable: |  |  |  |  |  |  |  |  |  |  |
Total loans and Leases | 398,858 |  |  |  | 297,284 |  |  |  | 398,858 | 297,284 |
Individually evaluated for impairment | 5,129 |  |  |  | 4,452 |  |  |  | 5,129 | 4,452 |
Collectively evaluated for impairment | 393,729 |  |  |  | 292,832 |  |  |  | 393,729 | 292,832 |
Non-PCI Loans | Consumer loans |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses on loans and leases: |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 122 |  |  |  | 199 | 122 | 199 |
Charge-offs |  |  |  |  |  |  |  |  | 0 | 0 |
Recoveries on loans and leases previously charged off |  |  |  |  |  |  |  |  | 2 | 15 |
Loan and lease loss provision (income) |  |  |  |  |  |  |  |  | (26) | (92) |
Balance at end of period | 98 |  |  |  | 122 |  |  |  | 98 | 122 | 199
Individually evaluated for impairment | 0 |  |  |  | 10 |  |  |  | 0 | 10 |
Collectively evaluated for impairment | 98 |  |  |  | 112 |  |  |  | 98 | 112 |
Loans and leases receivable: |  |  |  |  |  |  |  |  |  |  |
Total loans and Leases | 13,424 |  |  |  | 17,059 |  |  |  | 13,424 | 17,059 |
Individually evaluated for impairment | 839 |  |  |  | 1,029 |  |  |  | 839 | 1,029 |
Collectively evaluated for impairment | 12,585 |  |  |  | 16,030 |  |  |  | 12,585 | 16,030 |
Non-PCI Loans | Unallocated |  |  |  |  |  |  |  |  |  |  |
Allowance for loan losses on loans and leases: |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | $ 230 |  |  |  | $ 166 | 230 | 166 |
Charge-offs |  |  |  |  |  |  |  |  | 0 | 0 |
Recoveries on loans and leases previously charged off |  |  |  |  |  |  |  |  | 0 | 0 |
Loan and lease loss provision (income) |  |  |  |  |  |  |  |  | (203) | 64 |
Balance at end of period | 27 |  |  |  | 230 |  |  |  | 27 | 230 | $ 166
Individually evaluated for impairment | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Collectively evaluated for impairment | 27 |  |  |  | 230 |  |  |  | 27 | 230 |
Loans and leases receivable: |  |  |  |  |  |  |  |  |  |  |
Total loans and Leases | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Individually evaluated for impairment | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Collectively evaluated for impairment | $ 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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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 5: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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