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Loans and Leases Receivable and Allowance for Loan and Lease Losses - Schedule of Allowance for Loan Losses (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | $ 39,972 | $ 38,015 |  |
Charge-offs | (9,590) | (4,757) |  |
Recoveries | 1,770 | 1,072 |  |
Provision for loan and lease losses | 24,227 | 5,642 |  |
Ending Balance | 56,379 | 39,972 |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Individually evaluated for impairment |  |  | $ 31,272 | $ 39,118
Collectively evaluated for impairment |  |  | 7,268,143 | 7,077,806
Loans receivable, at amortized cost or lower of cost or market |  |  | 7,316,903 | 7,138,498
Individually evaluated for impairment |  |  | 852 | 845
Collectively evaluated for impairment |  |  | 52,901 | 36,249
Total allowance for loan losses | 39,972 | 39,972 | 56,379 | 39,972
Purchased credit impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Loans acquired with credit deterioration |  |  | 17,488 | 21,574
Loans receivable, at amortized cost or lower of cost or market |  |  | 17,488 | 21,574
Loans acquired with credit deterioration |  |  | 2,626 | 2,878
Multi-family |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 11,462 | 12,168 |  |
Charge-offs | (541) | 0 |  |
Recoveries | 7 | 0 |  |
Provision for loan and lease losses | (4,771) | (706) |  |
Ending Balance | 6,157 | 11,462 |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Individually evaluated for impairment |  |  | 4,117 | 1,155
Collectively evaluated for impairment |  |  | 1,903,469 | 3,282,452
Loans receivable, at amortized cost or lower of cost or market |  |  | 1,909,274 | 3,285,297
Individually evaluated for impairment |  |  | 0 | 539
Collectively evaluated for impairment |  |  | 6,157 | 10,923
Total allowance for loan losses | 11,462 | 11,462 | 6,157 | 11,462
Multi-family | Purchased credit impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Loans acquired with credit deterioration |  |  | 1,688 | 1,690
Loans receivable, at amortized cost or lower of cost or market |  |  | 1,688 | 1,690
Loans acquired with credit deterioration |  |  | 0 | 0
Commercial and industrial |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 12,145 | 10,918 |  |
Charge-offs | (532) | (1,722) |  |
Recoveries | 1,050 | 403 |  |
Provision for loan and lease losses | 2,893 | 2,546 |  |
Ending Balance | 15,556 | 12,145 |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Individually evaluated for impairment |  |  | 4,591 | 17,828
Collectively evaluated for impairment |  |  | 1,885,035 | 1,355,436
Loans receivable, at amortized cost or lower of cost or market |  |  | 1,889,980 | 1,373,800
Individually evaluated for impairment |  |  | 523 | 261
Collectively evaluated for impairment |  |  | 14,768 | 11,516
Total allowance for loan losses | 12,145 | 12,145 | 15,556 | 12,145
Commercial and industrial | Purchased credit impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Loans acquired with credit deterioration |  |  | 354 | 536
Loans receivable, at amortized cost or lower of cost or market |  |  | 354 | 536
Loans acquired with credit deterioration |  |  | 265 | 368
Commercial real estate owner occupied |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 3,320 | 3,232 |  |
Charge-offs | (119) | (747) |  |
Recoveries | 236 | 326 |  |
Provision for loan and lease losses | (1,202) | 509 |  |
Ending Balance | 2,235 | 3,320 |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Individually evaluated for impairment |  |  | 1,976 | 1,069
Collectively evaluated for impairment |  |  | 543,367 | 567,970
Loans receivable, at amortized cost or lower of cost or market |  |  | 552,007 | 577,477
Individually evaluated for impairment |  |  | 83 | 1
Collectively evaluated for impairment |  |  | 2,113 | 3,319
Total allowance for loan losses | 3,320 | 3,320 | 2,235 | 3,320
Commercial real estate owner occupied | Purchased credit impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Loans acquired with credit deterioration |  |  | 6,664 | 8,438
Loans receivable, at amortized cost or lower of cost or market |  |  | 6,664 | 8,438
Loans acquired with credit deterioration |  |  | 39 | 0
Commercial real estate non-owner occupied |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 6,093 | 7,437 |  |
Charge-offs | 0 | 0 |  |
Recoveries | 0 | 5 |  |
Provision for loan and lease losses | 150 | (1,349) |  |
Ending Balance | 6,243 | 6,093 |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Individually evaluated for impairment |  |  | 76 | 129
Collectively evaluated for impairment |  |  | 1,219,926 | 1,120,633
Loans receivable, at amortized cost or lower of cost or market |  |  | 1,223,529 | 1,125,106
Individually evaluated for impairment |  |  | 0 | 0
Collectively evaluated for impairment |  |  | 4,361 | 4,161
Total allowance for loan losses | 6,093 | 6,093 | 6,243 | 6,093
Commercial real estate non-owner occupied | Purchased credit impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Loans acquired with credit deterioration |  |  | 3,527 | 4,344
Loans receivable, at amortized cost or lower of cost or market |  |  | 3,527 | 4,344
Loans acquired with credit deterioration |  |  | 1,882 | 1,932
Construction |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 624 | 979 |  |
Charge-offs | 0 | 0 |  |
Recoveries | 136 | 241 |  |
Provision for loan and lease losses | 502 | (596) |  |
Ending Balance | 1,262 | 624 |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Individually evaluated for impairment |  |  | 0 | 0
Collectively evaluated for impairment |  |  | 118,418 | 56,491
Loans receivable, at amortized cost or lower of cost or market |  |  | 118,418 | 56,491
Individually evaluated for impairment |  |  | 0 | 0
Collectively evaluated for impairment |  |  | 1,262 | 624
Total allowance for loan losses | 1,262 | 979 | 1,262 | 624
Construction | Purchased credit impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Loans acquired with credit deterioration |  |  | 0 | 0
Loans receivable, at amortized cost or lower of cost or market |  |  | 0 | 0
Loans acquired with credit deterioration |  |  | 0 | 0
Residential real estate |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 3,654 | 2,929 |  |
Charge-offs | (297) | (466) |  |
Recoveries | 27 | 76 |  |
Provision for loan and lease losses | (166) | 1,115 |  |
Ending Balance | 3,218 | 3,654 |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Individually evaluated for impairment |  |  | 9,063 | 8,631
Collectively evaluated for impairment |  |  | 362,480 | 553,593
Loans receivable, at amortized cost or lower of cost or market |  |  | 375,014 | 566,561
Individually evaluated for impairment |  |  | 44 | 41
Collectively evaluated for impairment |  |  | 2,923 | 3,227
Total allowance for loan losses | 3,654 | 3,654 | 3,218 | 3,654
Residential real estate | Purchased credit impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Loans acquired with credit deterioration |  |  | 3,471 | 4,337
Loans receivable, at amortized cost or lower of cost or market |  |  | 3,471 | 4,337
Loans acquired with credit deterioration |  |  | 251 | 386
Manufactured housing |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 145 | 180 |  |
Charge-offs | 0 | 0 |  |
Recoveries | 0 | 0 |  |
Provision for loan and lease losses | 915 | (35) |  |
Ending Balance | 1,060 | 145 |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Individually evaluated for impairment |  |  | 9,898 | 10,195
Collectively evaluated for impairment |  |  | 58,899 | 67,528
Loans receivable, at amortized cost or lower of cost or market |  |  | 70,398 | 79,731
Individually evaluated for impairment |  |  | 129 | 3
Collectively evaluated for impairment |  |  | 897 | 89
Total allowance for loan losses | 145 | 145 | 1,060 | 145
Manufactured housing | Purchased credit impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Loans acquired with credit deterioration |  |  | 1,601 | 2,008
Loans receivable, at amortized cost or lower of cost or market |  |  | 1,601 | 2,008
Loans acquired with credit deterioration |  |  | 34 | 53
Other consumer |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 2,529 | 172 |  |
Charge-offs | (8,101) | (1,822) |  |
Recoveries | 314 | 21 |  |
Provision for loan and lease losses | 25,906 | 4,158 |  |
Ending Balance | 20,648 | 2,529 |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Individually evaluated for impairment |  |  | 1,551 | 111
Collectively evaluated for impairment |  |  | 1,176,549 | 73,703
Loans receivable, at amortized cost or lower of cost or market |  |  | 1,178,283 | 74,035
Individually evaluated for impairment |  |  | 73 | 0
Collectively evaluated for impairment |  |  | 20,420 | 2,390
Total allowance for loan losses | $ 20,648 | $ 172 | 20,648 | 2,529
Other consumer | Purchased credit impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |
Loans acquired with credit deterioration |  |  | 183 | 221
Loans receivable, at amortized cost or lower of cost or market |  |  | 183 | 221
Loans acquired with credit deterioration |  |  | $ 155 | $ 139

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