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Loans and Lease Finance Receivables and Allowance for Credit Losses - Schedule of Balance and Activity Related to Allowance for Loan Losses for Held-for-Investment Loans by Type (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Beginning Balance | $ 85,117 | $ 65,019
Charge-offs | 110 | 16
Recoveries | 33 | 11
Initial ACL for PCD Loans at Acquisition |  | 8,605
Provision Recorded at Acquisition |  | 4,932
Provision for (Recapture of) Credit Losses | 1,500 | (2,432)
Ending Balance | 86,540 | 76,119
Commercial Real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Beginning Balance | 64,806 | 50,950
Charge-offs | 0 | 0
Recoveries | 0 | 0
Initial ACL for PCD Loans at Acquisition |  | 5,086
Provision Recorded at Acquisition |  | 4,127
Provision for (Recapture of) Credit Losses | 2,311 | (2,328)
Ending Balance | 67,117 | 57,835
Construction [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Beginning Balance | 1,702 | 765
Charge-offs | 0 | 0
Recoveries | 3 | 3
Initial ACL for PCD Loans at Acquisition |  | 122
Provision Recorded at Acquisition |  | 58
Provision for (Recapture of) Credit Losses | (31) | 40
Ending Balance | 1,674 | 988
Small Business Administration [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Beginning Balance | 2,809 | 2,668
Charge-offs | 94 | 0
Recoveries | 12 | 5
Initial ACL for PCD Loans at Acquisition |  | 62
Provision Recorded at Acquisition |  | 64
Provision for (Recapture of) Credit Losses | 2 | 25
Ending Balance | 2,729 | 2,824
SBA - Paycheck Protection Program (PPP) [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Beginning Balance | 0 | 0
Charge-offs | 0 | 0
Recoveries | 0 | 0
Initial ACL for PCD Loans at Acquisition |  | 0
Provision Recorded at Acquisition |  | 0
Provision for (Recapture of) Credit Losses | 0 | 0
Ending Balance | 0 | 0
Commercial and Industrial [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Beginning Balance | 10,206 | 6,669
Charge-offs | 16 | 15
Recoveries | 14 | 3
Initial ACL for PCD Loans at Acquisition |  | 500
Provision Recorded at Acquisition |  | 508
Provision for (Recapture of) Credit Losses | (1,241) | (834)
Ending Balance | 8,963 | 6,831
Dairy & Livestock and Agribusiness [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Beginning Balance | 4,400 | 3,066
Charge-offs | 0 | 0
Recoveries | 4 | 0
Initial ACL for PCD Loans at Acquisition |  | 2,832
Provision Recorded at Acquisition |  | 149
Provision for (Recapture of) Credit Losses | 366 | 656
Ending Balance | 4,770 | 6,703
Municipal Lease Finance Receivables [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Beginning Balance | 296 | 100
Charge-offs | 0 | 0
Recoveries | 0 | 0
Initial ACL for PCD Loans at Acquisition |  | 3
Provision Recorded at Acquisition |  | 26
Provision for (Recapture of) Credit Losses | (13) | 23
Ending Balance | 283 | 152
SFR Mortgage [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Beginning Balance | 366 | 188
Charge-offs | 0 | 0
Recoveries | 0 | 0
Initial ACL for PCD Loans at Acquisition |  | 0
Provision Recorded at Acquisition |  | 0
Provision for (Recapture of) Credit Losses | 43 | 39
Ending Balance | 409 | 227
Consumer and Other Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Beginning Balance | 532 | 613
Charge-offs | 0 | 1
Recoveries | 0 | 0
Initial ACL for PCD Loans at Acquisition |  | 0
Provision Recorded at Acquisition |  | 0
Provision for (Recapture of) Credit Losses | 63 | (53)
Ending Balance | $ 595 | $ 559

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- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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- Definition Amount of allowance for credit loss at acquisition date of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), purchased with credit deterioration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 10 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922903-210455 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI https://asc.fasb.org/extlink&oid=122038336&loc=d3e74567-122707 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI https://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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