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	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
2023	$ 651,552
2022	1,608,241	$ 1,683,162
2021	1,402,964	1,512,519
2020	1,124,447	1,178,645
2019	668,632	744,349
2018		633,929
Prior	2,453,629	2,265,644
Revolving loans amortized cost basis	943,285	1,002,474
Revolving loans converted to term loans	52,160	58,670
Total	8,904,910	9,079,392
Gross charge-off prior	292
Gross charge-offs Revolving loans converted to term loans	113
Gross charge-off total	405
Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	638,501
2022	1,593,595	1,674,387
2021	1,381,084	1,499,083
2020	1,065,424	1,149,567
2019	605,169	690,504
2018		599,162
Prior	2,337,278	2,163,284
Revolving loans amortized cost basis	854,820	963,645
Revolving loans converted to term loans	44,899	48,948
Total	8,520,770	8,788,580
Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	12,307
2022	6,262	7,240
2021	18,989	13,436
2020	25,622	12,686
2019	49,639	36,589
2018		28,398
Prior	80,928	78,625
Revolving loans amortized cost basis	82,676	33,783
Revolving loans converted to term loans	5,520	1,397
Total	281,943	212,154
Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	744
2022	8,384	1,535
2021	2,891	0
2020	33,401	16,392
2019	13,824	17,256
2018		6,369
Prior	35,423	23,735
Revolving loans amortized cost basis	5,789	5,046
Revolving loans converted to term loans	1,741	8,325
Total	102,197	78,658
Doubtful & Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023
2022		0
2021		0
2020		0
2019		0
2018		0
Prior		0
Revolving loans amortized cost basis		0
Revolving loans converted to term loans		0
Total		0
Commercial real estate loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	451,976
2022	1,327,587	1,367,018
2021	1,152,090	1,209,404
2020	938,359	984,873
2019	554,351	592,100
2018		528,353
Prior	2,146,639	1,987,303
Revolving loans amortized cost basis	174,935	176,281
Revolving loans converted to term loans	38,568	39,616
Total	6,784,505	6,884,948
Commercial real estate loans [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	447,991
2022	1,315,563	1,363,733
2021	1,133,331	1,197,290
2020	885,590	957,965
2019	497,541	542,827
2018		506,613
Prior	2,041,329	1,889,478
Revolving loans amortized cost basis	171,223	175,373
Revolving loans converted to term loans	38,568	39,616
Total	6,531,136	6,672,895
Commercial real estate loans [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	3,241
2022	3,897	3,285
2021	15,868	12,114
2020	19,368	11,284
2019	43,824	32,976
2018		21,646
Prior	74,673	76,290
Revolving loans amortized cost basis	2,911	908
Revolving loans converted to term loans		0
Total	163,782	158,503
Commercial real estate loans [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	744
2022	8,127	0
2021	2,891	0
2020	33,401	15,624
2019	12,986	16,297
2018		94
Prior	30,637	21,535
Revolving loans amortized cost basis	801	0
Revolving loans converted to term loans		0
Total	89,587	53,550
Commercial real estate loans [Member] | Doubtful & Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023
2022		0
2021		0
2020		0
2019		0
2018		0
Prior		0
Revolving loans amortized cost basis		0
Revolving loans converted to term loans		0
Total		0
Construction Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	1,274
2022	15,046	17,203
2021	24,418	26,689
2020	8,058	16,578
2019		0
2018		4,951
Prior		0
Revolving loans amortized cost basis	17,938	22,850
Revolving loans converted to term loans		0
Total	66,734	88,271
Construction Loans [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	1,274
2022	15,046	17,203
2021	22,288	26,689
2020	8,058	16,578
2019		0
2018		0
Prior		0
Revolving loans amortized cost basis	17,938	22,850
Revolving loans converted to term loans		0
Total	64,604	83,320
Construction Loans [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023
2022		0
2021	2,130	0
2020		0
2019		0
2018		4,951
Prior		0
Revolving loans amortized cost basis		0
Revolving loans converted to term loans		0
Total	2,130	4,951
Construction Loans [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023
2022		0
2021		0
2020		0
2019		0
2018		0
Prior		0
Revolving loans amortized cost basis		0
Revolving loans converted to term loans		0
Total		0
Construction Loans [Member] | Doubtful & Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023
2022		0
2021		0
2020		0
2019		0
2018		0
Prior		0
Revolving loans amortized cost basis		0
Revolving loans converted to term loans		0
Total		0
SBA Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	20,701
2022	49,839	60,623
2021	51,038	54,781
2020	34,090	35,243
2019	8,117	8,781
2018		30,735
Prior	106,834	99,719
Revolving loans amortized cost basis	0	1,026
Revolving loans converted to term loans	0	0
Total	270,619	290,908
Gross charge-off prior	288
Gross charge-off total	288
SBA Loans [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	20,701
2022	48,212	60,623
2021	51,038	54,781
2020	29,306	35,243
2019	6,236	7,460
2018		28,886
Prior	101,856	96,473
Revolving loans amortized cost basis	0	1,026
Revolving loans converted to term loans	0	0
Total	257,349	284,492
SBA Loans [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023
2022	1,627	0
2021		0
2020	4,784	0
2019	1,132	1,321
2018		1,293
Prior	1,760	2,065
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	9,303	4,679
SBA Loans [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023
2022		0
2021		0
2020		0
2019	749	0
2018		556
Prior	3,218	1,181
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	3,967	1,737
SBA Loans [Member] | Doubtful & Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023
2022		0
2021		0
2020		0
2019		0
2018		0
Prior		0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total		0
SBA - Paycheck Protection Program (PPP) [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0	0
2021	699	5,515
2020	2,037	3,572
2019	0	0
2018		0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	2,736	9,087
SBA - Paycheck Protection Program (PPP) [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0	0
2021	699	5,515
2020	2,037	3,572
2019	0	0
2018		0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	2,736	9,087
SBA - Paycheck Protection Program (PPP) [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0	0
2021		0
2020		0
2019	0	0
2018		0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total		0
SBA - Paycheck Protection Program (PPP) [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0	0
2021		0
2020		0
2019	0	0
2018		0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total		0
SBA - Paycheck Protection Program (PPP) [Member] | Doubtful & Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0	0
2021		0
2020		0
2019	0	0
2018		0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total		0
Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	148,909
2022	144,842	159,214
2021	100,804	135,923
2020	89,295	81,950
2019	72,555	103,844
2018		48,817
Prior	99,309	85,910
Revolving loans amortized cost basis	302,555	323,945
Revolving loans converted to term loans	11,626	9,080
Total	969,895	948,683
Gross charge-offs Revolving loans converted to term loans	109
Gross charge-off total	109
Commercial and Industrial [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	141,080
2022	143,847	154,765
2021	100,059	135,162
2020	88,743	80,763
2019	68,352	101,192
2018		42,731
Prior	94,027	85,406
Revolving loans amortized cost basis	289,539	305,589
Revolving loans converted to term loans	5,460	7,775
Total	931,107	913,383
Commercial and Industrial [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	7,829
2022	738	3,955
2021	745	761
2020	552	459
2019	4,114	1,693
2018		462
Prior	3,986	8
Revolving loans amortized cost basis	10,529	15,156
Revolving loans converted to term loans	5,347	544
Total	33,840	23,038
Commercial and Industrial [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023
2022	257	494
2021		0
2020		728
2019	89	959
2018		5,624
Prior	1,296	496
Revolving loans amortized cost basis	2,487	3,200
Revolving loans converted to term loans	819	761
Total	4,948	12,262
Commercial and Industrial [Member] | Doubtful & Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023
2022		0
2021		0
2020		0
2019		0
2018		0
Prior		0
Revolving loans amortized cost basis		0
Revolving loans converted to term loans		0
Total		0
Dairy & Livestock and Agribusiness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	744
2022	0	1,248
2021	1,586	2,318
2020	931	1,555
2019	105	786
2018		210
Prior	268	741
Revolving loans amortized cost basis	409,257	419,199
Revolving loans converted to term loans	0	7,507
Total	412,891	433,564
Dairy & Livestock and Agribusiness [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	296
2022	0	207
2021	1,586	2,318
2020	931	1,515
2019	80	187
2018		69
Prior	208	628
Revolving loans amortized cost basis	337,525	400,229
Revolving loans converted to term loans	0	450
Total	340,626	405,603
Dairy & Livestock and Agribusiness [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	448
2022	0	0
2021		0
2020		0
2019	25	599
2018		46
Prior		0
Revolving loans amortized cost basis	69,232	17,129
Revolving loans converted to term loans	0	853
Total	69,705	18,627
Dairy & Livestock and Agribusiness [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023
2022	0	1,041
2021		0
2020		40
2019		0
2018		95
Prior	60	113
Revolving loans amortized cost basis	2,500	1,841
Revolving loans converted to term loans	0	6,204
Total	2,560	9,334
Dairy & Livestock and Agribusiness [Member] | Doubtful & Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023
2022	0	0
2021		0
2020		0
2019		0
2018		0
Prior		0
Revolving loans amortized cost basis		0
Revolving loans converted to term loans	0	0
Total		0
Municipal Lease Finance Receivables [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	5,735	6,442
2021	25,803	26,858
2020	5,981	6,814
2019	4,267	4,327
2018		4,948
Prior	31,804	31,737
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	73,590	81,126
Municipal Lease Finance Receivables [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	5,735	6,442
2021	25,803	26,858
2020	5,981	6,814
2019	4,267	4,327
2018		4,948
Prior	31,622	31,292
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	73,408	80,681
Municipal Lease Finance Receivables [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022		0
2021		0
2020		0
2019		0
2018		0
Prior	182	262
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	182	262
Municipal Lease Finance Receivables [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022		0
2021		0
2020		0
2019		0
2018		0
Prior		183
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total		183
Municipal Lease Finance Receivables [Member] | Doubtful & Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022		0
2021		0
2020		0
2019		0
2018		0
Prior		0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total		0
SFR mortgage [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	23,037
2022	61,070
2021	43,573	46,748
2020	44,994	46,762
2019	28,593	33,585
2018		15,836
Prior	68,277	58,944
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	324	388
Total	269,868	266,024
SFR mortgage [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	22,248
2022	61,070	63,761
2021	43,573	46,748
2020	44,076	45,819
2019	28,049	33,585
2018		15,836
Prior	67,750	58,730
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans		0
Total	266,766	264,479
SFR mortgage [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	789
2022		0
2021		0
2020	918	943
2019	544	0
2018		0
Prior	327	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans		0
Total	2,578	943
SFR mortgage [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023
2022		0
2021		0
2020		0
2019		0
2018		0
Prior	200	214
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	324	388
Total	524	602
SFR mortgage [Member] | Doubtful & Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023
2022		0
2021		0
2020		0
2019		0
2018		0
Prior		0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans		0
Total		0
Consumer and Other Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	4,911
2022	4,122	7,653
2021	2,953	4,283
2020	702	1,298
2019	644	926
2018		79
Prior	498	1,290
Revolving loans amortized cost basis	38,600	59,173
Revolving loans converted to term loans	1,642	2,079
Total	54,072	76,781
Gross charge-off prior	4
Gross charge-offs Revolving loans converted to term loans	4
Gross charge-off total	8
Consumer and Other Loans [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023	4,911
2022	4,122	7,653
2021	2,707	3,722
2020	702	1,298
2019	644	926
2018		79
Prior	486	1,277
Revolving loans amortized cost basis	38,595	58,578
Revolving loans converted to term loans	871	1,107
Total	53,038	74,640
Consumer and Other Loans [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023
2022		0
2021	246	561
2020		0
2019		0
2018		0
Prior		0
Revolving loans amortized cost basis	4	590
Revolving loans converted to term loans	173	0
Total	423	1,151
Consumer and Other Loans [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023
2022		0
2021		0
2020		0
2019		0
2018		0
Prior	12	13
Revolving loans amortized cost basis	1	5
Revolving loans converted to term loans	598	972
Total	611	990
Consumer and Other Loans [Member] | Doubtful & Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2023
2022		0
2021		0
2020		0
2019		0
2018		0
Prior		0
Revolving loans amortized cost basis		0
Revolving loans converted to term loans		0
Total		$ 0