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Loans and Lease Finance Receivables and Allowance for Credit Losses - Summary of Loan, Including PCI Loans by Internal Risk Ratings (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Commercial real estate, Non-owner occupied |  | $ 3,290,967
Total loans | $ 8,348,808 | 7,568,319
Commercial And Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross | 812,062 | 935,127
SBA [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross | 303,896 | 305,008
Total loans | 303,896 |
Commercial real estate, owner occupied [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 2,083,650
Total loans | 2,143,259 | 2,083,650
Construction, Speculative [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 106,895
Construction, Non-speculative [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 10,030
SFR mortgage [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross | 270,511 | 283,468
Total loans | 270,511 |
Dairy & Livestock and Agribusiness [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross | 361,146 | 383,709
Municipal Lease Finance Receivables [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross | 45,547 | 53,146
Total loans | 45,547 | 53,146
Consumer Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross | 86,006 | 116,319
Total loans | 86,006 |
Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Commercial real estate, Non-owner occupied |  | 3,280,580
Total loans | 8,046,192 | 7,321,402
Pass [Member] | Commercial And Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 895,234
Pass [Member] | SBA [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 283,430
Total loans | 279,708 |
Pass [Member] | Commercial real estate, owner occupied [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 1,977,007
Pass [Member] | Construction, Speculative [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 106,895
Pass [Member] | Construction, Non-speculative [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 10,030
Pass [Member] | SFR mortgage [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 280,010
Total loans | 266,441 |
Pass [Member] | Dairy & Livestock and Agribusiness [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 320,670
Pass [Member] | Municipal Lease Finance Receivables [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 52,676
Total loans | 45,135 |
Pass [Member] | Consumer Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 114,870
Total loans | 84,483 |
Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Commercial real estate, Non-owner occupied |  | 10,005
Total loans | 223,797 | 173,486
Special Mention [Member] | Commercial And Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 35,473
Special Mention [Member] | SBA [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 11,032
Total loans | 12,430 |
Special Mention [Member] | Commercial real estate, owner occupied [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 78,208
Special Mention [Member] | Construction, Speculative [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 0
Special Mention [Member] | Construction, Non-speculative [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 0
Special Mention [Member] | SFR mortgage [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 1,957
Total loans | 452 |
Special Mention [Member] | Dairy & Livestock and Agribusiness [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 35,920
Special Mention [Member] | Municipal Lease Finance Receivables [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 470
Total loans | 412 |
Special Mention [Member] | Consumer Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 421
Total loans | 630 |
Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Commercial real estate, Non-owner occupied |  | 382
Total loans | 78,819 | 73,431
Substandard [Member] | Commercial And Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 4,420
Substandard [Member] | SBA [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 10,546
Total loans | 11,758 |
Substandard [Member] | Commercial real estate, owner occupied [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 28,435
Substandard [Member] | Construction, Speculative [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 0
Substandard [Member] | Construction, Non-speculative [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 0
Substandard [Member] | SFR mortgage [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 1,501
Total loans | 3,618 |
Substandard [Member] | Dairy & Livestock and Agribusiness [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 27,119
Substandard [Member] | Municipal Lease Finance Receivables [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 0
Total loans | 0 |
Substandard [Member] | Consumer Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 1,028
Total loans | 893 |
Doubtful & Loss [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Commercial real estate, Non-owner occupied |  | 0
Total loans | 0 | 0
Doubtful & Loss [Member] | Commercial And Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 0
Doubtful & Loss [Member] | SBA [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 0
Total loans | 0 |
Doubtful & Loss [Member] | Commercial real estate, owner occupied [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 0
Doubtful & Loss [Member] | Construction, Speculative [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 0
Doubtful & Loss [Member] | Construction, Non-speculative [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 0
Doubtful & Loss [Member] | SFR mortgage [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 0
Total loans | 0 |
Doubtful & Loss [Member] | Dairy & Livestock and Agribusiness [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 0
Doubtful & Loss [Member] | Municipal Lease Finance Receivables [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | 0
Total loans | 0 |
Doubtful & Loss [Member] | Consumer Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross |  | $ 0
Total loans | $ 0 |

X
- Definition Amount before allowance of commercial loans issued to businesses to acquire, develop, construct, improve, or refinance land or building. These loans are not secured by owner-occupied real estate. Amount also includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements. + References No definition available. + Details
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