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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Allowance for Loan and Lease Losses and Recorded Investment Excluding Accrued Interest in Loans (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Balance at beginning of year | $ 40,444 | $ 35,533 | $ 29,480 |  |
Charge-offs | (5,581) | (2,618) | (1,942) |  |
Recoveries | 771 | 2,258 | 526 |  |
Provision | 13,699 | 5,271 |  |  |
Balance at end of year | 49,333 | 40,444 | 35,533 |  |
Individually evaluated for impairment |  |  |  | $ 1,217 | $ 243
Collectively evaluated for impairment |  |  |  | 48,116 | 40,097
Total ending allowance balance | 40,444 | 35,533 | 29,480 | 49,333 | 40,444
Loans: |  |  |  |  |
Individually evaluated for impairment |  |  |  | 24,050 | 13,352
Collectively evaluated for impairment |  |  |  | 6,635,357 | 5,879,574
Total ending loan balances |  |  |  | 6,659,407 | 6,034,752
PCI Loans |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Balance at beginning of year | 104 |  |  |  |
Balance at end of year | 0 | 104 |  |  |
Total ending allowance balance | 104 | 104 |  | 0 | 104
Loans: |  |  |  |  |
Total ending loan balances |  |  |  | 0 | 141,826
Commercial | Commercial and industrial |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Balance at beginning of year | 7,584 | 5,850 |  |  |
Charge-offs | (1,730) | (166) |  |  |
Recoveries | 54 | 225 |  |  |
Provision | 8,372 | 1,675 |  |  |
Balance at end of year | 14,280 | 7,584 | 5,850 |  |
Individually evaluated for impairment |  |  |  | 498 | 0
Collectively evaluated for impairment |  |  |  | 13,782 | 7,584
Total ending allowance balance | 7,584 | 5,850 | 5,850 | 14,280 | 7,584
Loans: |  |  |  |  |
Individually evaluated for impairment |  |  |  | 3,582 | 2,429
Collectively evaluated for impairment |  |  |  | 1,698,369 | 1,515,771
Total ending loan balances |  |  |  | 1,701,951 | 1,522,960
Commercial | Commercial and industrial | PCI Loans |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Balance at beginning of year | 0 |  |  |  |
Balance at end of year | 0 | 0 |  |  |
Total ending allowance balance | 0 | 0 |  | 0 | 0
Loans: |  |  |  |  |
Total ending loan balances |  |  |  | 0 | 4,760
Commercial | Commercial real estate |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Balance at beginning of year | 5,467 | 4,252 |  |  |
Charge-offs | (113) | (414) |  |  |
Recoveries | 0 | 807 |  |  |
Provision | (383) | 822 |  |  |
Balance at end of year | 4,971 | 5,467 | 4,252 |  |
Individually evaluated for impairment |  |  |  | 0 | 0
Collectively evaluated for impairment |  |  |  | 4,971 | 5,462
Total ending allowance balance | 5,467 | 4,252 | 4,252 | 4,971 | 5,467
Loans: |  |  |  |  |
Individually evaluated for impairment |  |  |  | 0 | 0
Collectively evaluated for impairment |  |  |  | 717,415 | 728,777
Total ending loan balances |  |  |  | 717,415 | 729,959
Commercial | Commercial real estate | PCI Loans |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Balance at beginning of year | 5 |  |  |  |
Balance at end of year | 0 | 5 |  |  |
Total ending allowance balance | 5 | 5 |  | 0 | 5
Loans: |  |  |  |  |
Total ending loan balances |  |  |  | 0 | 1,182
Commercial | Multifamily |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Balance at beginning of year | 11,376 | 6,012 |  |  |
Charge-offs | 0 | 0 |  |  |
Recoveries | 0 | 169 |  |  |
Provision | 1,889 | 5,195 |  |  |
Balance at end of year | 13,265 | 11,376 | 6,012 |  |
Individually evaluated for impairment |  |  |  | 0 | 0
Collectively evaluated for impairment |  |  |  | 13,265 | 11,376
Total ending allowance balance | 11,376 | 6,012 | 6,012 | 13,265 | 11,376
Loans: |  |  |  |  |
Individually evaluated for impairment |  |  |  | 0 | 0
Collectively evaluated for impairment |  |  |  | 1,816,141 | 1,365,262
Total ending loan balances |  |  |  | 1,816,141 | 1,365,262
Commercial | Multifamily | PCI Loans |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Balance at beginning of year | 0 |  |  |  |
Balance at end of year | 0 | 0 |  |  |
Total ending allowance balance | 0 | 0 |  | 0 | 0
Loans: |  |  |  |  |
Total ending loan balances |  |  |  | 0 | 0
Commercial | SBA |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Balance at beginning of year | 939 | 683 |  |  |
Charge-offs | (625) | 0 |  |  |
Recoveries | 422 | 500 |  |  |
Provision | 965 | (244) |  |  |
Balance at end of year | 1,701 | 939 | 683 |  |
Individually evaluated for impairment |  |  |  | 435 | 0
Collectively evaluated for impairment |  |  |  | 1,266 | 920
Total ending allowance balance | 939 | 683 | 683 | 1,701 | 939
Loans: |  |  |  |  |
Individually evaluated for impairment |  |  |  | 944 | 0
Collectively evaluated for impairment |  |  |  | 77,755 | 71,168
Total ending loan balances |  |  |  | 78,699 | 73,840
Commercial | SBA | PCI Loans |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Balance at beginning of year | 19 |  |  |  |
Balance at end of year | 0 | 19 |  |  |
Total ending allowance balance | 19 | 19 |  | 0 | 19
Loans: |  |  |  |  |
Total ending loan balances |  |  |  | 0 | 2,672
Commercial | Construction |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Balance at beginning of year | 2,015 | 1,530 |  |  |
Charge-offs | (29) | 0 |  |  |
Recoveries | 0 | 0 |  |  |
Provision | 1,332 | 485 |  |  |
Balance at end of year | 3,318 | 2,015 | 1,530 |  |
Individually evaluated for impairment |  |  |  | 0 | 0
Collectively evaluated for impairment |  |  |  | 3,318 | 2,015
Total ending allowance balance | 2,015 | 1,530 | 1,530 | 3,318 | 2,015
Loans: |  |  |  |  |
Individually evaluated for impairment |  |  |  | 0 | 0
Collectively evaluated for impairment |  |  |  | 182,960 | 125,100
Total ending loan balances |  |  |  | 182,960 | 125,100
Commercial | Construction | PCI Loans |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Balance at beginning of year | 0 |  |  |  |
Balance at end of year | 0 | 0 |  |  |
Total ending allowance balance | 0 | 0 |  | 0 | 0
Loans: |  |  |  |  |
Total ending loan balances |  |  |  | 0 | 0
Commercial | Lease financing |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Balance at beginning of year | 6 | 2,195 |  |  |
Charge-offs | 0 | (974) |  |  |
Recoveries | 32 | 283 |  |  |
Provision | (38) | (1,498) |  |  |
Balance at end of year | 0 | 6 | 2,195 |  |
Individually evaluated for impairment |  |  |  | 0 | 0
Collectively evaluated for impairment |  |  |  | 0 | 6
Total ending allowance balance | 6 | 2,195 | 2,195 | 0 | 6
Loans: |  |  |  |  |
Individually evaluated for impairment |  |  |  | 0 | 0
Collectively evaluated for impairment |  |  |  | 13 | 379
Total ending loan balances |  |  |  | 13 | 379
Commercial | Lease financing | PCI Loans |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Balance at beginning of year | 0 |  |  |  |
Balance at end of year | 0 | 0 |  |  |
Total ending allowance balance | 0 | 0 |  | 0 | 0
Loans: |  |  |  |  |
Total ending loan balances |  |  |  | 0 | 0
Consumer | Single Family Residential Mortgage |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Balance at beginning of year | 12,075 | 13,854 |  |  |
Charge-offs | (2,806) | (1,057) |  |  |
Recoveries | 1 | 248 |  |  |
Provision | 1,726 | (970) |  |  |
Balance at end of year | 10,996 | 12,075 | 13,854 |  |
Individually evaluated for impairment |  |  |  | 277 | 243
Collectively evaluated for impairment |  |  |  | 10,719 | 11,752
Total ending allowance balance | 12,075 | 13,854 | 13,854 | 10,996 | 12,075
Loans: |  |  |  |  |
Individually evaluated for impairment |  |  |  | 14,699 | 10,629
Collectively evaluated for impairment |  |  |  | 2,040,950 | 1,962,789
Total ending loan balances |  |  |  | 2,055,649 | 2,106,630
Consumer | Single Family Residential Mortgage | PCI Loans |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Balance at beginning of year | 80 |  |  |  |
Balance at end of year | 0 | 80 |  |  |
Total ending allowance balance | 80 | 80 |  | 0 | 80
Loans: |  |  |  |  |
Total ending loan balances |  |  |  | 0 | 133,212
Consumer | Other Consumer |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Balance at beginning of year | 982 | 1,157 |  |  |
Charge-offs | (278) | (7) |  |  |
Recoveries | 262 | 26 |  |  |
Provision | (164) | (194) |  |  |
Balance at end of year | 802 | 982 | 1,157 |  |
Individually evaluated for impairment |  |  |  | 7 | 0
Collectively evaluated for impairment |  |  |  | 795 | 982
Total ending allowance balance | 982 | 1,157 | $ 1,157 | 802 | 982
Loans: |  |  |  |  |
Individually evaluated for impairment |  |  |  | 4,825 | 294
Collectively evaluated for impairment |  |  |  | 101,754 | 110,328
Total ending loan balances |  |  |  | 106,579 | 110,622
Consumer | Other Consumer | PCI Loans |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Balance at beginning of year | 0 |  |  |  |
Balance at end of year | 0 | 0 |  |  |
Total ending allowance balance | $ 0 | $ 0 |  | 0 | 0
Loans: |  |  |  |  |
Total ending loan balances |  |  |  | $ 0 | $ 0

X
- 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 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 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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