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Loans and Lease Finance Receivables and Allowance for Loan Losses - Schedule of Held-for-Investment Loans, Excluding PCI Loans, Individually Evaluated for Impairment by Class of Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Recorded Investment, With no related allowance recorded | $ 14,457 | $ 29,905 | $ 15,146
Recorded Investment, With a related allowance recorded | 0 | 144 | 379
Recorded Investment, Total impaired loans | 14,457 | 30,049 | 15,525
Unpaid Principal Balance, With no related allowance recorded | 18,068 | 35,951 | 18,702
Unpaid Principal Balance, With a related allowance recorded | 0 | 161 | 409
Unpaid Principal Balance, Total impaired loans | 18,068 | 36,112 | 19,111
Related Allowance, With no related allowance recorded | 0 | 0 | 0
Related Allowance, With a related allowance recorded | 0 | 97 | 75
Related Allowance, Total impaired loans | 0 | 97 | 75
Average Recorded Investment, With no related allowance recorded | 14,688 | 30,209 |
Average Recorded Investment, With a related allowance recorded | 0 | 162 |
Average Recorded Investment, Total impaired loans | 14,688 | 30,371 |
Interest Income Recognized, With no related allowance recorded | 61 | 495 |
Interest Income Recognized, With a related allowance recorded | 0 | 2 |
Interest Income Recognized, Total impaired loans | 61 | 497 |
Commercial and Industrial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Recorded Investment, With no related allowance recorded | 432 | 1,015 | 440
Recorded Investment, With a related allowance recorded | 0 | 135 | 0
Unpaid Principal Balance, With no related allowance recorded | 986 | 1,985 | 980
Unpaid Principal Balance, With a related allowance recorded | 0 | 136 | 0
Related Allowance, With no related allowance recorded | 0 | 0 | 0
Related Allowance, With a related allowance recorded | 0 | 88 | 0
Average Recorded Investment, With no related allowance recorded | 461 | 1,045 |
Average Recorded Investment, With a related allowance recorded | 0 | 152 |
Interest Income Recognized, With no related allowance recorded | 2 | 6 |
Interest Income Recognized, With a related allowance recorded | 0 | 2 |
Small Business Administration [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Recorded Investment, With no related allowance recorded | 1,201 | 1,917 | 1,530
Recorded Investment, With a related allowance recorded | 0 | 9 | 1
Unpaid Principal Balance, With no related allowance recorded | 1,327 | 2,272 | 1,699
Unpaid Principal Balance, With a related allowance recorded | 0 | 25 | 18
Related Allowance, With no related allowance recorded | 0 | 0 | 0
Related Allowance, With a related allowance recorded | 0 | 9 | 1
Average Recorded Investment, With no related allowance recorded | 1,220 | 1,960 |
Average Recorded Investment, With a related allowance recorded | 0 | 10 |
Interest Income Recognized, With no related allowance recorded | 12 | 16 |
Interest Income Recognized, With a related allowance recorded | 0 | 0 |
Commercial Real Estate Owner Occupied [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Recorded Investment, With no related allowance recorded | 4,332 | 6,669 | 4,365
Recorded Investment, With a related allowance recorded | 0 | 0 | 0
Unpaid Principal Balance, With no related allowance recorded | 4,755 | 7,081 | 4,763
Unpaid Principal Balance, With a related allowance recorded | 0 | 0 | 0
Related Allowance, With no related allowance recorded | 0 | 0 | 0
Related Allowance, With a related allowance recorded | 0 | 0 | 0
Average Recorded Investment, With no related allowance recorded | 4,348 | 6,434 |
Average Recorded Investment, With a related allowance recorded | 0 | 0 |
Interest Income Recognized, With no related allowance recorded | 0 | 32 |
Interest Income Recognized, With a related allowance recorded | 0 | 0 |
Commercial Real Estate Non-owner Occupied [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Recorded Investment, With no related allowance recorded | 3,660 | 13,547 | 3,768
Recorded Investment, With a related allowance recorded | 0 | 0 | 0
Unpaid Principal Balance, With no related allowance recorded | 5,033 | 16,198 | 5,107
Unpaid Principal Balance, With a related allowance recorded | 0 | 0 | 0
Related Allowance, With no related allowance recorded | 0 | 0 | 0
Related Allowance, With a related allowance recorded | 0 | 0 | 0
Average Recorded Investment, With no related allowance recorded | 3,715 | 13,479 |
Average Recorded Investment, With a related allowance recorded | 0 | 0 |
Interest Income Recognized, With no related allowance recorded | 22 | 401 |
Interest Income Recognized, With a related allowance recorded | 0 | 0 |
Construction Speculative [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Recorded Investment, With no related allowance recorded | 0 | 384 | 0
Recorded Investment, With a related allowance recorded | 0 | 0 | 0
Unpaid Principal Balance, With no related allowance recorded | 0 | 402 | 0
Unpaid Principal Balance, With a related allowance recorded | 0 | 0 | 0
Related Allowance, With no related allowance recorded | 0 | 0 | 0
Related Allowance, With a related allowance recorded | 0 | 0 | 0
Average Recorded Investment, With no related allowance recorded | 0 | 384 |
Average Recorded Investment, With a related allowance recorded | 0 | 0 |
Interest Income Recognized, With no related allowance recorded | 0 | 0 |
Interest Income Recognized, With a related allowance recorded | 0 | 0 |
Construction Non-speculative [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Recorded Investment, With no related allowance recorded | 0 | 0 | 0
Recorded Investment, With a related allowance recorded | 0 | 0 | 0
Unpaid Principal Balance, With no related allowance recorded | 0 | 0 | 0
Unpaid Principal Balance, With a related allowance recorded | 0 | 0 | 0
Related Allowance, With no related allowance recorded | 0 | 0 | 0
Related Allowance, With a related allowance recorded | 0 | 0 | 0
Average Recorded Investment, With no related allowance recorded | 0 | 0 |
Average Recorded Investment, With a related allowance recorded | 0 | 0 |
Interest Income Recognized, With no related allowance recorded | 0 | 0 |
Interest Income Recognized, With a related allowance recorded | 0 | 0 |
SFR Mortgage [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Recorded Investment, With no related allowance recorded | 3,576 | 4,248 | 4,040
Recorded Investment, With a related allowance recorded | 0 | 0 | 0
Unpaid Principal Balance, With no related allowance recorded | 4,236 | 5,024 | 4,692
Unpaid Principal Balance, With a related allowance recorded | 0 | 0 | 0
Related Allowance, With no related allowance recorded | 0 | 0 | 0
Related Allowance, With a related allowance recorded | 0 | 0 | 0
Average Recorded Investment, With no related allowance recorded | 3,599 | 4,259 |
Average Recorded Investment, With a related allowance recorded | 0 | 0 |
Interest Income Recognized, With no related allowance recorded | 25 | 34 |
Interest Income Recognized, With a related allowance recorded | 0 | 0 |
Dairy & Livestock and Agribusiness [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Recorded Investment, With no related allowance recorded | 818 | 1,324 | 829
Recorded Investment, With a related allowance recorded | 0 | 0 | 0
Unpaid Principal Balance, With no related allowance recorded | 1,091 | 1,610 | 1,091
Unpaid Principal Balance, With a related allowance recorded | 0 | 0 | 0
Related Allowance, With no related allowance recorded | 0 | 0 | 0
Related Allowance, With a related allowance recorded | 0 | 0 | 0
Average Recorded Investment, With no related allowance recorded | 826 | 1,839 |
Average Recorded Investment, With a related allowance recorded | 0 | 0 |
Interest Income Recognized, With no related allowance recorded | 0 | 1 |
Interest Income Recognized, With a related allowance recorded | 0 | 0 |
Municipal Lease Finance Receivables [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Recorded Investment, With no related allowance recorded | 0 | 0 | 0
Recorded Investment, With a related allowance recorded | 0 | 0 | 0
Unpaid Principal Balance, With no related allowance recorded | 0 | 0 | 0
Unpaid Principal Balance, With a related allowance recorded | 0 | 0 | 0
Related Allowance, With no related allowance recorded | 0 | 0 | 0
Related Allowance, With a related allowance recorded | 0 | 0 | 0
Average Recorded Investment, With no related allowance recorded | 0 | 0 |
Average Recorded Investment, With a related allowance recorded | 0 | 0 |
Interest Income Recognized, With no related allowance recorded | 0 | 0 |
Interest Income Recognized, With a related allowance recorded | 0 | 0 |
Consumer and Other Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Recorded Investment, With no related allowance recorded | 438 | 801 | 174
Recorded Investment, With a related allowance recorded | 0 | 0 | 378
Unpaid Principal Balance, With no related allowance recorded | 640 | 1,379 | 370
Unpaid Principal Balance, With a related allowance recorded | 0 | 0 | 391
Related Allowance, With no related allowance recorded | 0 | 0 | 0
Related Allowance, With a related allowance recorded | 0 | 0 | $ 74
Average Recorded Investment, With no related allowance recorded | 519 | 809 |
Average Recorded Investment, With a related allowance recorded | 0 | 0 |
Interest Income Recognized, With no related allowance recorded | 0 | 5 |
Interest Income Recognized, With a related allowance recorded | $ 0 | $ 0 |

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