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Loans Receivable and Allowance for Loan Losses - Schedule of Allowance for Loan Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Dec. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance | $ 39,499 | $ 39,883 | $ 38,015 | $ 37,315 |  |
Charge-offs | (1,161) | (2,148) | (1,850) | (2,991) |  |
Recoveries | 734 | 188 | 790 | 549 |  |
Provision for loan losses | (784) | 535 | 1,333 | 3,585 |  |
Ending balance | 38,288 | 38,458 | 38,288 | 38,458 |  |
Loans: |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  | $ 37,629 | $ 38,435
Collectively evaluated for impairment |  |  |  |  | 7,118,881 | 6,702,825
Loans receivable, gross |  |  |  |  | 7,181,084 | 6,768,175
Allowance for loan losses: |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  | 1,381 | 1,451
Collectively evaluated for impairment |  |  |  |  | 33,472 | 32,537
Total Allowance for loan losses | 39,499 | 39,883 | 38,015 | 37,315 | 38,288 | 38,015
Purchased Credit Impaired Loans |  |  |  |  |  |
Loans: |  |  |  |  |  |
Loans acquired with credit deterioration |  |  |  |  | 24,574 | 26,915
Loans receivable, gross |  |  |  |  | 24,574 | 26,915
Allowance for loan losses: |  |  |  |  |  |
Loans acquired with credit deterioration |  |  |  |  | 3,435 | 4,027
Multi-family |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance | 12,545 | 12,283 | 12,168 | 11,602 |  |
Charge-offs | 0 | 0 | 0 | 0 |  |
Recoveries | 0 | 0 | 0 | 0 |  |
Provision for loan losses | (476) | (255) | (99) | 426 |  |
Ending balance | 12,069 | 12,028 | 12,069 | 12,028 |  |
Loans: |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  | 1,343 | 0
Collectively evaluated for impairment |  |  |  |  | 3,539,640 | 3,500,500
Loans receivable, gross |  |  |  |  | 3,542,770 | 3,502,381
Allowance for loan losses: |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  | 0 | 0
Collectively evaluated for impairment |  |  |  |  | 12,069 | 12,168
Total Allowance for loan losses | 12,545 | 12,283 | 12,168 | 11,602 | 12,069 | 12,168
Multi-family | Purchased Credit Impaired Loans |  |  |  |  |  |
Loans: |  |  |  |  |  |
Loans acquired with credit deterioration |  |  |  |  | 1,787 | 1,881
Loans receivable, gross |  |  |  |  | 1,787 | 1,881
Allowance for loan losses: |  |  |  |  |  |
Loans acquired with credit deterioration |  |  |  |  | 0 | 0
Commercial and industrial |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance | 11,737 | 13,009 | 10,918 | 11,050 |  |
Charge-offs | (174) | (1,849) | (224) | (2,047) |  |
Recoveries | 140 | 68 | 175 | 283 |  |
Provision for loan losses | 555 | 357 | 1,389 | 2,299 |  |
Ending balance | 12,258 | 11,585 | 12,258 | 11,585 |  |
Loans: |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  | 13,750 | 17,461
Collectively evaluated for impairment |  |  |  |  | 1,252,168 | 1,130,865
Loans receivable, gross |  |  |  |  | 1,266,520 | 1,149,090
Allowance for loan losses: |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  | 1,062 | 650
Collectively evaluated for impairment |  |  |  |  | 10,749 | 9,804
Total Allowance for loan losses | 11,737 | 13,009 | 10,918 | 11,050 | 12,258 | 10,918
Commercial and industrial | Purchased Credit Impaired Loans |  |  |  |  |  |
Loans: |  |  |  |  |  |
Loans acquired with credit deterioration |  |  |  |  | 602 | 764
Loans receivable, gross |  |  |  |  | 602 | 764
Allowance for loan losses: |  |  |  |  |  |
Loans acquired with credit deterioration |  |  |  |  | 447 | 464
Commercial real estate - owner occupied |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance | 3,525 | 2,394 | 3,232 | 2,183 |  |
Charge-offs | (483) | 0 | (501) | 0 |  |
Recoveries | 326 | 9 | 326 | 9 |  |
Provision for loan losses | (380) | 573 | (69) | 784 |  |
Ending balance | 2,988 | 2,976 | 2,988 | 2,976 |  |
Loans: |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  | 759 | 1,448
Collectively evaluated for impairment |  |  |  |  | 534,882 | 472,708
Loans receivable, gross |  |  |  |  | 545,231 | 484,728
Allowance for loan losses: |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  | 1 | 642
Collectively evaluated for impairment |  |  |  |  | 2,987 | 2,580
Total Allowance for loan losses | 3,525 | 2,394 | 3,232 | 2,183 | 2,988 | 3,232
Commercial real estate - owner occupied | Purchased Credit Impaired Loans |  |  |  |  |  |
Loans: |  |  |  |  |  |
Loans acquired with credit deterioration |  |  |  |  | 9,590 | 10,572
Loans receivable, gross |  |  |  |  | 9,590 | 10,572
Allowance for loan losses: |  |  |  |  |  |
Loans acquired with credit deterioration |  |  |  |  | 0 | 10
Commercial real estate - non-owner occupied |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance | 7,233 | 7,847 | 7,437 | 7,894 |  |
Charge-offs | 0 | (4) | 0 | (408) |  |
Recoveries | 0 | 0 | 0 | 0 |  |
Provision for loan losses | (535) | (57) | (739) | 300 |  |
Ending balance | 6,698 | 7,786 | 6,698 | 7,786 |  |
Loans: |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  | 2,536 | 160
Collectively evaluated for impairment |  |  |  |  | 1,148,581 | 1,213,309
Loans receivable, gross |  |  |  |  | 1,155,998 | 1,218,719
Allowance for loan losses: |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  | 0 | 0
Collectively evaluated for impairment |  |  |  |  | 4,334 | 4,630
Total Allowance for loan losses | 7,233 | 7,847 | 7,437 | 7,894 | 6,698 | 7,437
Commercial real estate - non-owner occupied | Purchased Credit Impaired Loans |  |  |  |  |  |
Loans: |  |  |  |  |  |
Loans acquired with credit deterioration |  |  |  |  | 4,881 | 5,250
Loans receivable, gross |  |  |  |  | 4,881 | 5,250
Allowance for loan losses: |  |  |  |  |  |
Loans acquired with credit deterioration |  |  |  |  | 2,364 | 2,807
Construction |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance | 921 | 885 | 979 | 840 |  |
Charge-offs | 0 | 0 | 0 | 0 |  |
Recoveries | 209 | 49 | 220 | 130 |  |
Provision for loan losses | (138) | (218) | (207) | (254) |  |
Ending balance | 992 | 716 | 992 | 716 |  |
Loans: |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  | 0 | 0
Collectively evaluated for impairment |  |  |  |  | 88,141 | 85,393
Loans receivable, gross |  |  |  |  | 88,141 | 85,393
Allowance for loan losses: |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  | 0 | 0
Collectively evaluated for impairment |  |  |  |  | 992 | 979
Total Allowance for loan losses | 921 | 885 | 979 | 840 | 992 | 979
Construction | Purchased Credit Impaired Loans |  |  |  |  |  |
Loans: |  |  |  |  |  |
Loans acquired with credit deterioration |  |  |  |  | 0 | 0
Loans receivable, gross |  |  |  |  | 0 | 0
Allowance for loan losses: |  |  |  |  |  |
Loans acquired with credit deterioration |  |  |  |  | 0 | 0
Residential real estate |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance | 3,179 | 3,080 | 2,929 | 3,342 |  |
Charge-offs | (42) | (69) | (407) | (290) |  |
Recoveries | 56 | 6 | 63 | 27 |  |
Provision for loan losses | (285) | (22) | 323 | (84) |  |
Ending balance | 2,908 | 2,995 | 2,908 | 2,995 |  |
Loans: |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  | 8,775 | 9,247
Collectively evaluated for impairment |  |  |  |  | 479,386 | 219,162
Loans receivable, gross |  |  |  |  | 493,222 | 234,090
Allowance for loan losses: |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  | 313 | 155
Collectively evaluated for impairment |  |  |  |  | 2,106 | 2,177
Total Allowance for loan losses | 3,179 | 3,080 | 2,929 | 3,342 | 2,908 | 2,929
Residential real estate | Purchased Credit Impaired Loans |  |  |  |  |  |
Loans: |  |  |  |  |  |
Loans acquired with credit deterioration |  |  |  |  | 5,061 | 5,681
Loans receivable, gross |  |  |  |  | 5,061 | 5,681
Allowance for loan losses: |  |  |  |  |  |
Loans acquired with credit deterioration |  |  |  |  | 489 | 597
Manufactured housing |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance | 176 | 284 | 180 | 286 |  |
Charge-offs | 0 | 0 | 0 | 0 |  |
Recoveries | 0 | 0 | 0 | 0 |  |
Provision for loan losses | (27) | (16) | (31) | (18) |  |
Ending balance | 149 | 268 | 149 | 268 |  |
Loans: |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  | 10,372 | 10,089
Collectively evaluated for impairment |  |  |  |  | 72,531 | 77,587
Loans receivable, gross |  |  |  |  | 85,328 | 90,227
Allowance for loan losses: |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  | 5 | 4
Collectively evaluated for impairment |  |  |  |  | 81 | 82
Total Allowance for loan losses | 176 | 284 | 180 | 286 | 149 | 180
Manufactured housing | Purchased Credit Impaired Loans |  |  |  |  |  |
Loans: |  |  |  |  |  |
Loans acquired with credit deterioration |  |  |  |  | 2,425 | 2,551
Loans receivable, gross |  |  |  |  | 2,425 | 2,551
Allowance for loan losses: |  |  |  |  |  |
Loans acquired with credit deterioration |  |  |  |  | 63 | 94
Other |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance | 183 | 101 | 172 | 118 |  |
Charge-offs | (462) | (226) | (718) | (246) |  |
Recoveries | 3 | 56 | 6 | 100 |  |
Provision for loan losses | 502 | 173 | 766 | 132 |  |
Ending balance | 226 | 104 | 226 | 104 |  |
Loans: |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  | 94 | 30
Collectively evaluated for impairment |  |  |  |  | 3,552 | 3,301
Loans receivable, gross |  |  |  |  | 3,874 | 3,547
Allowance for loan losses: |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  | 0 | 0
Collectively evaluated for impairment |  |  |  |  | 154 | 117
Total Allowance for loan losses | $ 183 | $ 101 | $ 172 | $ 118 | 226 | 172
Other | Purchased Credit Impaired Loans |  |  |  |  |  |
Loans: |  |  |  |  |  |
Loans acquired with credit deterioration |  |  |  |  | 228 | 216
Loans receivable, gross |  |  |  |  | 228 | 216
Allowance for loan losses: |  |  |  |  |  |
Loans acquired with credit deterioration |  |  |  |  | $ 72 | $ 55

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