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	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
2022	$ 1,683,162	$ 1,620,118
2021	1,512,519	1,183,367
2020	1,178,645	798,755
2019	744,349	677,205
2018	633,929	638,690
Prior	2,265,644	2,001,549
Revolving loans amortized cost basis	1,002,474	904,441
Revolving loans converted to term loans	58,670	63,588
Total	9,079,392	7,887,713
Commercial real estate loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	1,367,018	1,140,847
2021	1,209,404	984,337
2020	984,873	608,538
2019	592,100	557,498
2018	528,353	532,629
Prior	1,987,303	1,755,641
Revolving loans amortized cost basis	176,281	169,762
Revolving loans converted to term loans	39,616	40,478
Total	6,884,948	5,789,730
Construction Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	17,203	10,511
2021	26,689	15,896
2020	16,578	7,236
2019		3,359
2018	4,951
Prior
Revolving loans amortized cost basis	22,850	25,262
Revolving loans converted to term loans
Total	88,271	62,264
SBA [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	60,623	70,929
2021	54,781	36,468
2020	35,243	11,129
2019	8,781	36,853
2018	30,735	46,652
Prior	99,719	86,569
Revolving loans amortized cost basis	1,026
Revolving loans converted to term loans
Total	290,908	288,600
SBA - Paycheck Protection Program (PPP) [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022		183,614
2021	5,515	2,971
2020	3,572
2019
2018
Prior
Revolving loans amortized cost basis
Revolving loans converted to term loans
Total	9,087	186,585
Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	159,214	147,294
2021	135,923	83,879
2020	81,950	127,376
2019	103,844	57,798
2018	48,817	33,354
Prior	85,910	74,101
Revolving loans amortized cost basis	323,945	279,019
Revolving loans converted to term loans	9,080	10,242
Total	948,683	813,063
Dairy & Livestock and Agribusiness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	1,248	2,808
2021	2,318	942
2020	1,555	1,285
2019	786	1,072
2018	210	95
Prior	741	295
Revolving loans amortized cost basis	419,199	371,291
Revolving loans converted to term loans	7,507	8,431
Total	433,564	386,219
Municipal Lease Finance Receivables [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	6,442	9,310
2021	26,858	7,666
2020	6,814
2019	4,327	279
2018	4,948	9,528
Prior	31,737	19,150
Revolving loans amortized cost basis
Revolving loans converted to term loans
Total	81,126	45,933
SFR mortgage [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	63,761	48,821
2021	46,748	49,261
2020	46,762	41,776
2019	33,585	19,877
2018	15,836	16,046
Prior	58,944	64,017
Revolving loans amortized cost basis		451
Revolving loans converted to term loans	388	405
Total	266,024	240,654
Consumer and other loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	7,653	5,984
2021	4,283	1,947
2020	1,298	1,415
2019	926	469
2018	79	386
Prior	1,290	1,776
Revolving loans amortized cost basis	59,173	58,656
Revolving loans converted to term loans	2,079	4,032
Total	76,781	74,665
Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	1,674,387	1,613,286
2021	1,499,083	1,160,790
2020	1,149,567	780,690
2019	690,504	646,886
2018	599,162	581,735
Prior	2,163,284	1,939,076
Revolving loans amortized cost basis	963,645	872,585
Revolving loans converted to term loans	48,948	44,388
Total	8,788,580	7,639,436
Pass [Member] \| Commercial real estate loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	1,363,733	1,137,714
2021	1,197,290	963,697
2020	957,965	591,202
2019	542,827	534,468
2018	506,613	484,721
Prior	1,889,478	1,704,267
Revolving loans amortized cost basis	175,373	156,841
Revolving loans converted to term loans	39,616	33,564
Total	6,672,895	5,606,474
Pass [Member] \| Construction Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	17,203	10,511
2021	26,689	15,896
2020	16,578	7,236
2019
2018
Prior
Revolving loans amortized cost basis	22,850	25,262
Revolving loans converted to term loans
Total	83,320	58,905
Pass [Member] \| SBA [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	60,623	70,929
2021	54,781	36,468
2020	35,243	11,129
2019	7,460	36,068
2018	28,886	38,504
Prior	96,473	78,527
Revolving loans amortized cost basis	1,026
Revolving loans converted to term loans
Total	284,492	271,625
Pass [Member] \| SBA - Paycheck Protection Program (PPP) [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022		183,614
2021	5,515	2,969
2020	3,572
2019
2018
Prior
Revolving loans amortized cost basis
Revolving loans converted to term loans
Total	9,087	186,583
Pass [Member] \| Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	154,765	145,494
2021	135,162	81,944
2020	80,763	126,647
2019	101,192	54,690
2018	42,731	32,455
Prior	85,406	73,600
Revolving loans amortized cost basis	305,589	267,659
Revolving loans converted to term loans	7,775	6,992
Total	913,383	789,481
Pass [Member] \| Dairy & Livestock and Agribusiness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	207	1,756
2021	2,318	942
2020	1,515	1,285
2019	187	1,035
2018	69	95
Prior	628	295
Revolving loans amortized cost basis	400,229	364,312
Revolving loans converted to term loans	450	454
Total	405,603	370,174
Pass [Member] \| Municipal Lease Finance Receivables [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	6,442	9,310
2021	26,858	7,666
2020	6,814
2019	4,327	279
2018	4,948	9,528
Prior	31,292	18,811
Revolving loans amortized cost basis
Revolving loans converted to term loans
Total	80,681	45,594
Pass [Member] \| SFR mortgage [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	63,761	48,813
2021	46,748	49,261
2020	45,819	41,776
2019	33,585	19,877
2018	15,836	16,046
Prior	58,730	61,965
Revolving loans amortized cost basis		451
Revolving loans converted to term loans
Total	264,479	238,189
Pass [Member] \| Consumer and other loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	7,653	5,145
2021	3,722	1,947
2020	1,298	1,415
2019	926	469
2018	79	386
Prior	1,277	1,611
Revolving loans amortized cost basis	58,578	58,060
Revolving loans converted to term loans	1,107	3,378
Total	74,640	72,411
Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	7,240	6,588
2021	13,436	22,569
2020	12,686	14,604
2019	36,589	20,852
2018	28,398	47,712
Prior	78,625	47,260
Revolving loans amortized cost basis	33,783	23,909
Revolving loans converted to term loans	1,397	8,681
Total	212,154	192,175
Special Mention [Member] \| Commercial real estate loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	3,285	3,133
2021	12,114	20,640
2020	11,284	14,477
2019	32,976	16,097
2018	21,646	43,262
Prior	76,290	44,045
Revolving loans amortized cost basis	908	6,970
Revolving loans converted to term loans		6,800
Total	158,503	155,424
Special Mention [Member] \| Construction Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022
2021
2020
2019		3,359
2018	4,951
Prior
Revolving loans amortized cost basis
Revolving loans converted to term loans
Total	4,951	3,359
Special Mention [Member] \| SBA [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022
2021
2020
2019	1,321
2018	1,293	4,056
Prior	2,065	2,700
Revolving loans amortized cost basis
Revolving loans converted to term loans
Total	4,679	6,756
Special Mention [Member] \| SBA - Paycheck Protection Program (PPP) [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022
2021
2020
2019
2018
Prior
Revolving loans amortized cost basis
Revolving loans converted to term loans
Total
Special Mention [Member] \| Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	3,955	1,556
2021	761	1,929
2020	459	127
2019	1,693	1,396
2018	462	394
Prior	8	26
Revolving loans amortized cost basis	15,156	9,369
Revolving loans converted to term loans	544	177
Total	23,038	14,974
Special Mention [Member] \| Dairy & Livestock and Agribusiness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022		1,052
2021
2020
2019	599
2018	46
Prior
Revolving loans amortized cost basis	17,129	6,979
Revolving loans converted to term loans	853	1,301
Total	18,627	9,332
Special Mention [Member] \| Municipal Lease Finance Receivables [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022
2021
2020
2019
2018
Prior	262	339
Revolving loans amortized cost basis
Revolving loans converted to term loans
Total	262	339
Special Mention [Member] \| SFR mortgage [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022		8
2021
2020	943
2019
2018
Prior
Revolving loans amortized cost basis
Revolving loans converted to term loans
Total	943	8
Special Mention [Member] \| Consumer and other loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022		839
2021	561
2020
2019
2018
Prior		150
Revolving loans amortized cost basis	590	591
Revolving loans converted to term loans		403
Total	1,151	1,983
Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	1,535	244
2021		8
2020	16,392	3,461
2019	17,256	9,467
2018	6,369	9,243
Prior	23,735	15,213
Revolving loans amortized cost basis	5,046	7,947
Revolving loans converted to term loans	8,325	10,519
Total	78,658	56,102
Substandard [Member] \| Commercial real estate loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022
2021
2020	15,624	2,859
2019	16,297	6,933
2018	94	4,646
Prior	21,535	7,329
Revolving loans amortized cost basis		5,951
Revolving loans converted to term loans		114
Total	53,550	27,832
Substandard [Member] \| Construction Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022
2021
2020
2019
2018
Prior
Revolving loans amortized cost basis
Revolving loans converted to term loans
Total
Substandard [Member] \| SBA [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022
2021
2020
2019		785
2018	556	4,092
Prior	1,181	5,342
Revolving loans amortized cost basis
Revolving loans converted to term loans
Total	1,737	10,219
Substandard [Member] \| SBA - Paycheck Protection Program (PPP) [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022
2021		2
2020
2019
2018
Prior
Revolving loans amortized cost basis
Revolving loans converted to term loans
Total		2
Substandard [Member] \| Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	494	244
2021		6
2020	728	602
2019	959	1,712
2018	5,624	505
Prior	496	475
Revolving loans amortized cost basis	3,200	1,991
Revolving loans converted to term loans	761	3,073
Total	12,262	8,608
Substandard [Member] \| Dairy & Livestock and Agribusiness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022	1,041
2021
2020	40
2019		37
2018	95
Prior	113
Revolving loans amortized cost basis	1,841
Revolving loans converted to term loans	6,204	6,676
Total	9,334	6,713
Substandard [Member] \| Municipal Lease Finance Receivables [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022
2021
2020
2019
2018
Prior	183
Revolving loans amortized cost basis
Revolving loans converted to term loans
Total	183
Substandard [Member] \| SFR mortgage [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022
2021
2020
2019
2018
Prior	214	2,052
Revolving loans amortized cost basis
Revolving loans converted to term loans	388	405
Total	602	2,457
Substandard [Member] \| Consumer and other loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022
2021
2020
2019
2018
Prior	13	15
Revolving loans amortized cost basis	5	5
Revolving loans converted to term loans	972	251
Total	990	271
Doubtful & Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022
2021
2020
2019
2018
Prior
Revolving loans amortized cost basis
Revolving loans converted to term loans
Total
Doubtful & Loss [Member] \| Commercial real estate loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022		0
2021
2020
2019
2018
Prior
Revolving loans amortized cost basis
Revolving loans converted to term loans
Total
Doubtful & Loss [Member] \| Construction Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022
2021
2020
2019
2018
Prior
Revolving loans amortized cost basis
Revolving loans converted to term loans
Total
Doubtful & Loss [Member] \| SBA [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022
2021
2020
2019
2018
Prior
Revolving loans amortized cost basis
Revolving loans converted to term loans
Total
Doubtful & Loss [Member] \| SBA - Paycheck Protection Program (PPP) [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022
2021
2020
2019
2018
Prior
Revolving loans amortized cost basis
Revolving loans converted to term loans
Total
Doubtful & Loss [Member] \| Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2022
2021
2020
2019

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