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Loans and Leases Receivable and Allowance for Loan and Lease Losses - Summary of Impaired Loans (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment net of charge offs, total | $ 31,272 | $ 39,118 |
Unpaid principle balance, total | 34,127 | 42,031 |
Related allowance | 852 | 845 |
Average recorded investment, total | 33,532 | 36,980 | $ 36,177
Interest income recognized, total | 2,588 | 1,671 | 1,293
Multi-family |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment net of charge offs, with no related allowance recorded | 4,117 | 0 |
Recorded investment net of charge offs, with an allowance recorded | 0 | 1,155 |
Unpaid principal balance, with no related allowance recorded | 4,117 | 0 |
Unpaid principal balance, with an allowance recorded | 0 | 1,155 |
Related allowance | 0 | 539 |
Average recorded investment, with no related allowance recorded | 1,223 | 537 | 0
Average recorded investment, with an allowance recorded | 231 | 231 | 0
Interest income recognized, with no related allowance recorded | 239 | 8 | 0
Interest income recognized, with an allowance recorded | 0 | 37 | 0
Commercial and industrial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment net of charge offs, with no related allowance recorded | 3,084 | 13,660 |
Recorded investment net of charge offs, with an allowance recorded | 1,507 | 4,168 |
Unpaid principal balance, with no related allowance recorded | 4,726 | 15,263 |
Unpaid principal balance, with an allowance recorded | 1,507 | 4,351 |
Related allowance | 523 | 261 |
Average recorded investment, with no related allowance recorded | 7,439 | 8,831 | 8,865
Average recorded investment, with an allowance recorded | 3,723 | 6,504 | 5,984
Interest income recognized, with no related allowance recorded | 1,077 | 673 | 214
Interest income recognized, with an allowance recorded | 64 | 25 | 230
Commercial real estate owner occupied |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment net of charge offs, with no related allowance recorded | 1,109 | 1,037 |
Recorded investment net of charge offs, with an allowance recorded | 867 | 32 |
Unpaid principal balance, with no related allowance recorded | 1,880 | 1,766 |
Unpaid principal balance, with an allowance recorded | 878 | 32 |
Related allowance | 83 | 1 |
Average recorded investment, with no related allowance recorded | 1,111 | 776 | 1,439
Average recorded investment, with an allowance recorded | 278 | 443 | 882
Interest income recognized, with no related allowance recorded | 55 | 19 | 70
Interest income recognized, with an allowance recorded | 54 | 3 | 0
Commercial real estate non-owner occupied |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment net of charge offs, with no related allowance recorded | 76 | 129 |
Unpaid principal balance, with no related allowance recorded | 187 | 241 |
Average recorded investment, with no related allowance recorded | 97 | 645 | 898
Interest income recognized, with no related allowance recorded | 7 | 48 | 2
Residential real estate |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment net of charge offs, with no related allowance recorded | 4,559 | 4,842 |
Recorded investment net of charge offs, with an allowance recorded | 4,504 | 3,789 |
Unpaid principal balance, with no related allowance recorded | 4,861 | 5,128 |
Unpaid principal balance, with an allowance recorded | 4,522 | 3,789 |
Related allowance | 44 | 41 |
Average recorded investment, with no related allowance recorded | 2,766 | 4,129 | 4,617
Average recorded investment, with an allowance recorded | 2,523 | 4,566 | 3,307
Interest income recognized, with no related allowance recorded | 129 | 151 | 24
Interest income recognized, with an allowance recorded | 119 | 131 | 187
Manufactured housing |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment net of charge offs, with no related allowance recorded | 4,169 | 10,027 |
Recorded investment net of charge offs, with an allowance recorded | 5,729 | 168 |
Unpaid principal balance, with no related allowance recorded | 4,169 | 10,027 |
Unpaid principal balance, with an allowance recorded | 5,729 | 168 |
Related allowance | 129 | 3 |
Average recorded investment, with no related allowance recorded | 5,638 | 10,015 | 10,003
Average recorded investment, with an allowance recorded | 3,792 | 214 | 131
Interest income recognized, with no related allowance recorded | 325 | 561 | 558
Interest income recognized, with an allowance recorded | 253 | 14 | 8
Other consumer |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment net of charge offs, with no related allowance recorded | 140 | 111 |
Recorded investment net of charge offs, with an allowance recorded | 1,411 |  |
Unpaid principal balance, with no related allowance recorded | 140 | 111 |
Unpaid principal balance, with an allowance recorded | 1,411 |  |
Related allowance | 73 |  |
Average recorded investment, with no related allowance recorded | 4,127 | 89 | 51
Average recorded investment, with an allowance recorded | 584 |  |
Interest income recognized, with no related allowance recorded | 266 | $ 1 | $ 0
Interest income recognized, with an allowance recorded | $ 0 |  |

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