Loans and Lease Finance Receivables and Allowance for Credit Losses - Summary of loans by type and origination year, according to our internal risk ratings (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2025	Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]
2025	$ 583,962	$ 486,523
2024	462,173	570,662
2023	529,984	1,495,356
2022	1,418,804	1,284,963
2021	1,197,969	1,004,855
Prior	3,320,003	2,645,131
Revolving loans amortized cost basis	893,298	990,088
Revolving loans converted to term loans	64,713	58,854
Total	8,470,906	8,536,432
Financing Receivable Accrued Interest Year Three Originated Two Years Before Current Fiscal Year Writeoff	392	300
Financing Receivable Accrued Interest Originated More than Five Years before Current Fiscal Year Writeoff	118	3,609
Gross Charge Offs Revolving Loans Amortized Term Loans	5
Gross charge-offs Revolving loans converted to term loans	21	498
Gross charge-off total	536	4,408
Commercial Real Estate Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	396,059	310,235
2024	320,295	424,701
2023	398,304	1,259,406
2022	1,208,203	1,097,229
2021	1,032,072	860,687
Prior	2,900,141	2,308,579
Revolving loans amortized cost basis	236,188	207,624
Revolving loans converted to term loans	44,057	38,991
Total	6,535,319	6,507,452
Financing Receivable Accrued Interest Originated More than Five Years before Current Fiscal Year Writeoff		2,258
Gross charge-off total		2,258
Construction [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	10,144	7,717
2024	9,267	315
2023	326	8,050
2022	10,239	0
2021	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	29,976	16,082
SBA [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	20,110	33,531
2024	29,462	16,064
2023	15,304	47,974
2022	46,809	49,147
2021	45,505	28,449
Prior	109,038	97,848
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	266,228	273,013
Financing Receivable Accrued Interest Originated More than Five Years before Current Fiscal Year Writeoff	118	165
Gross charge-off total	118	165
SBA - Paycheck Protection Program (PPP) [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	0	0
2024	0	0
2023	0	0
2022	0	254
2021	51	520
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	51	774
Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	122,057	101,284
2024	77,136	105,484
2023	95,960	113,531
2022	90,004	69,886
2021	55,143	69,505
Prior	160,216	122,244
Revolving loans amortized cost basis	322,076	328,280
Revolving loans converted to term loans	16,582	14,964
Total	939,174	925,178
Financing Receivable Accrued Interest Year Three Originated Two Years Before Current Fiscal Year Writeoff	392	300
Financing Receivable Accrued Interest Originated More than Five Years before Current Fiscal Year Writeoff		1,186
Gross charge-offs Revolving loans converted to term loans	21	495
Gross charge-off total	413	1,981
Dairy and Livestock and Agribusiness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	395	3,713
2024	616	0
2023	800	0
2022	0	596
2021	553	786
Prior	849	201
Revolving loans amortized cost basis	288,459	412,145
Revolving loans converted to term loans	1,291	2,463
Total	292,963	419,904
Municipal Lease Finance Receivables [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	574	2,540
2024	2,710	0
2023	0	5,111
2022	4,722	24,715
2021	23,890	5,140
Prior	29,487	28,608
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	61,383	66,114
SFR Mortgage [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	32,571	20,261
2024	18,093	21,055
2023	17,194	59,763
2022	58,254	41,156
2021	39,924	39,626
Prior	119,813	87,027
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	262	284
Total	286,111	269,172
Consumer and Other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	2,052	7,242
2024	4,594	3,043
2023	2,096	1,521
2022	573	1,980
2021	831	142
Prior	459	624
Revolving loans amortized cost basis	46,575	42,039
Revolving loans converted to term loans	2,521	2,152
Total	59,701	58,743
Gross Charge Offs Revolving Loans Amortized Term Loans	5
Gross charge-off total	5
Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	574,786	480,552
2024	449,113	560,266
2023	514,228	1,448,946
2022	1,365,002	1,250,781
2021	1,169,616	966,628
Prior	3,156,706	2,495,112
Revolving loans amortized cost basis	859,550	886,023
Revolving loans converted to term loans	47,882	45,785
Total	8,136,883	8,134,093
Pass [Member] \| Commercial Real Estate Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	387,369	307,984
2024	310,736	419,547
2023	386,557	1,216,126
2022	1,157,775	1,066,694
2021	1,005,028	828,493
Prior	2,748,421	2,170,119
Revolving loans amortized cost basis	227,915	197,991
Revolving loans converted to term loans	35,047	37,704
Total	6,258,848	6,244,658
Pass [Member] \| Construction [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	10,144	7,717
2024	9,267	315
2023	326	8,050
2022	10,239	0
2021	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	29,976	16,082
Pass [Member] \| SBA [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	20,110	33,531
2024	26,097	16,064
2023	15,304	46,393
2022	45,260	47,810
2021	45,486	23,733
Prior	104,138	92,012
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	256,395	259,543
Pass [Member] \| SBA - Paycheck Protection Program (PPP) [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	0	0
2024	0	0
2023	0	0
2022	0	254
2021	51	520
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	51	774
Pass [Member] \| Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	121,966	100,465
2024	77,000	100,242
2023	92,751	111,982
2022	88,179	67,706
2021	53,900	69,084
Prior	154,283	118,069
Revolving loans amortized cost basis	313,863	318,147
Revolving loans converted to term loans	10,537	6,213
Total	912,479	891,908
Pass [Member] \| Dairy and Livestock and Agribusiness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	0	812
2024	616	0
2023	0	0
2022	0	596
2021	553	786
Prior	849	141
Revolving loans amortized cost basis	271,203	327,850
Revolving loans converted to term loans	74	13
Total	273,295	330,198
Pass [Member] \| Municipal Lease Finance Receivables [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	574	2,540
2024	2,710	0
2023	0	5,111
2022	4,722	24,715
2021	23,890	5,140
Prior	29,433	28,510
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	61,329	66,016
Pass [Member] \| SFR Mortgage [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	32,571	20,261
2024	18,093	21,055
2023	17,194	59,763
2022	58,254	41,156
2021	39,924	38,730
Prior	119,123	85,637
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	285,159	266,602
Pass [Member] \| Consumer and Other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	2,052	7,242
2024	4,594	3,043
2023	2,096	1,521
2022	573	1,850
2021	784	142
Prior	459	624
Revolving loans amortized cost basis	46,569	42,035
Revolving loans converted to term loans	2,224	1,855
Total	59,351	58,312
Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	4,163	4,795
2024	9,695	7,123
2023	10,141	37,531
2022	44,601	25,114
2021	23,526	23,089
Prior	124,907	110,715
Revolving loans amortized cost basis	26,002	96,372
Revolving loans converted to term loans	12,808	8,051
Total	255,843	312,790
Special Mention [Member] \| Commercial Real Estate Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	3,677	1,075
2024	9,559	4,910
2023	8,403	36,505
2022	43,116	21,478
2021	22,410	17,056
Prior	119,906	104,201
Revolving loans amortized cost basis	8,273	3,937
Revolving loans converted to term loans	9,010	1,287
Total	224,354	190,449
Special Mention [Member] \| Construction [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	0	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	0	0
Special Mention [Member] \| SBA [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	0	0
2024	0	0
2023	0	0
2022	0	1,337
2021	0	4,716
Prior	1,534	1,830
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	1,534	7,883
Special Mention [Member] \| SBA - Paycheck Protection Program (PPP) [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	0	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	0	0
Special Mention [Member] \| Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	91	819
2024	136	2,213
2023	1,738	1,026
2022	1,485	2,169
2021	1,069	421
Prior	3,033	4,175
Revolving loans amortized cost basis	7,216	8,136
Revolving loans converted to term loans	2,319	4,830
Total	17,087	23,789
Special Mention [Member] \| Dairy and Livestock and Agribusiness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	395	2,901
2024	0	0
2023	0	0
2022	0	0
2021	0	0
Prior	0	0
Revolving loans amortized cost basis	10,507	84,295
Revolving loans converted to term loans	1,217	1,650
Total	12,119	88,846
Special Mention [Member] \| Municipal Lease Finance Receivables [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	0	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
Prior	54	98
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	54	98
Special Mention [Member] \| SFR Mortgage [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	0	0
2024	0	0
2023	0	0
2022	0	0
2021	0	896
Prior	380	411
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	262	284
Total	642	1,591
Special Mention [Member] \| Consumer and Other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	0	0
2024	0	0
2023	0	0
2022	0	130
2021	47	0
Prior	0	0
Revolving loans amortized cost basis	6	4
Revolving loans converted to term loans	0	0
Total	53	134
Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	5,013	1,176
2024	3,365	3,273
2023	5,615	8,879
2022	9,201	9,068
2021	4,827	15,138
Prior	38,390	39,304
Revolving loans amortized cost basis	7,746	7,693
Revolving loans converted to term loans	4,023	5,018
Total	78,180	89,549
Substandard [Member] \| Commercial Real Estate Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	5,013	1,176
2024	0	244
2023	3,344	6,775
2022	7,312	9,057
2021	4,634	15,138
Prior	31,814	34,259
Revolving loans amortized cost basis	0	5,696
Revolving loans converted to term loans	0	0
Total	52,117	72,345
Substandard [Member] \| Construction [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	0	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	0	0
Substandard [Member] \| SBA [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	0	0
2024	3,365	0
2023	0	1,581
2022	1,549	0
2021	19	0
Prior	3,366	4,006
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	8,299	5,587
Substandard [Member] \| SBA - Paycheck Protection Program (PPP) [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	0	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	0	0
Substandard [Member] \| Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	0	0
2024	0	3,029
2023	1,471	523
2022	340	11
2021	174	0
Prior	2,900	0
Revolving loans amortized cost basis	997	1,997
Revolving loans converted to term loans	3,726	3,921
Total	9,608	9,481
Substandard [Member] \| Dairy and Livestock and Agribusiness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	0	0
2024	0	0
2023	800	0
2022	0	0
2021	0	0
Prior	0	60
Revolving loans amortized cost basis	6,749	0
Revolving loans converted to term loans	0	800
Total	7,549	860
Substandard [Member] \| Municipal Lease Finance Receivables [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	0	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	0	0
Substandard [Member] \| SFR Mortgage [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	0	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
Prior	310	979
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	310	979
Substandard [Member] \| Consumer and Other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	0	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	297	297
Total	297	297
Doubtful & Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	0	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	0	0
Doubtful & Loss [Member] \| Commercial Real Estate Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	0	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	0	0
Doubtful & Loss [Member] \| Construction [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	0	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	0	0
Doubtful & Loss [Member] \| SBA [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2025	0	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	0	0
Doubtful & Loss [Member] \| SBA - Paycheck Protection Program (PPP) [Member]

Financing Receivable Accrued Interest Originated More than Five Years before Current Fiscal Year Writeoff

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Financing Receivable Accrued Interest Year Three Originated Two Years Before Current Fiscal Year Writeoff

+ References

No definition available.

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- Definition

Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, Total

+ References

No definition available.

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- Definition

Financing Receivable Revolving Loans Converted To Term Loans

+ References

No definition available.

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Gross Charge Offs Revolving Loans Amortized Term Loans

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No definition available.

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No definition available.

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- Definition

Amortized cost of financing receivable originated more than five years prior to current fiscal year. Excludes net investment in lease.

+ References

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- Definition

Amortized cost of financing receivable originated four years prior to current fiscal year. Excludes net investment in lease.

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- Definition

Amortized cost of financing receivable originated in current fiscal year. Excludes net investment in lease.

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- Definition

Amortized cost of financing receivable originated in fiscal year prior to current fiscal year. Excludes net investment in lease.

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- Definition

Amortized cost of financing receivable originated three years prior to current fiscal year. Excludes net investment in lease.

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Amortized cost of financing receivable originated two years prior to current fiscal year. Excludes net investment in lease.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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