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	6 Months Ended	12 Months Ended
Jun. 30, 2024	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
2024	$ 226,569	$ 651,552
2023	626,311	1,608,241
2022	1,561,774	1,402,964
2021	1,355,592	1,124,447
2020	1,069,007	668,632
Prior	2,896,291	2,453,629
Revolving loans amortized cost basis	889,876	943,285
Revolving loans converted to term loans	56,426	52,160
Total	8,681,846	8,904,910
Gross charge-offs Revolving loans converted to term loans	434
Financing Receivable Accrued Interest Originated More than Five Years before Current Fiscal Year Writeoff	3,583
Gross charge-off total	4,318
Commercial Real Estate Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	139,375	1,327,587
2023	444,491	1,152,090
2022	1,300,453	938,359
2021	1,128,692	554,351
2020	905,910	451,976
Prior	2,522,411	2,146,639
Revolving loans amortized cost basis	184,947	174,935
Revolving loans converted to term loans	38,646	38,568
Total	6,664,925	6,784,505
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]
2024	1,601	15,046
2023	2,956	24,418
2022	15,222	8,058
2021	24,370	0
2020	8,078	1,274
Prior		0
Revolving loans amortized cost basis		17,938
Revolving loans converted to term loans		0
Total	52,227	66,734
SBA [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	17,018		$ 49,839
2023	18,160		51,038
2022	49,068		34,090
2021	50,152		8,117
2020	28,963		20,701
Prior	104,577		106,834
Revolving loans amortized cost basis			0
Revolving loans converted to term loans			0
Total	267,938		$ 270,619
Financing Receivable Accrued Interest Originated More than Five Years before Current Fiscal Year Writeoff	139	288
Gross charge-off total	139	288
SBA - Paycheck Protection Program (PPP) [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024		0
2023		699
2022		2,037
2021	478	0
2020	1,279	0
Prior		0
Revolving loans amortized cost basis		0
Revolving loans converted to term loans		0
Total	1,757	2,736
Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	52,771	144,842
2023	135,306	100,804
2022	128,534	89,295
2021	80,470	72,555
2020	77,162	148,909
Prior	144,389	99,309
Revolving loans amortized cost basis	324,637	302,555
Revolving loans converted to term loans	12,915	11,626
Total	956,184	969,895
Gross charge-offs Revolving loans converted to term loans	431
Financing Receivable Accrued Interest Originated More than Five Years before Current Fiscal Year Writeoff	1,186
Financing Receivable Accrued Interest Year Three Originated Two Years Before Current Fiscal Year Writeoff	300
Gross charge-off total	1,917
Dairy and Livestock and Agribusiness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	225	744
2023	417	0
2022		1,586
2021	640	931
2020	903	105
Prior	276	268
Revolving loans amortized cost basis	345,447	409,257
Revolving loans converted to term loans	2,654	0
Total	350,562	412,891
Municipal Lease Finance Receivables [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	792	0
2023		5,735
2022	5,374	25,803
2021	25,661	5,981
2020	5,604	4,267
Prior	33,458	31,804
Revolving loans amortized cost basis		0
Revolving loans converted to term loans		0
Total	70,889	73,590
SFR Mortgage [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	12,199	23,037
2023	21,246	61,070
2022	60,288	43,573
2021	42,662	44,994
2020	40,647	28,593
Prior	90,252	68,277
Revolving loans amortized cost basis		0
Revolving loans converted to term loans	299	324
Total	267,593	269,868
Consumer and Other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	2,588	4,911
2023	3,735	4,122
2022	2,835	2,953
2021	2,467	702
2020	461	644
Prior	928	498
Revolving loans amortized cost basis	34,845	38,600
Revolving loans converted to term loans	1,912	1,642
Total	49,771	54,072
Gross charge-off prior		4
Gross charge-offs Revolving loans converted to term loans	3	4
Gross charge-off total	4	8
Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	216,366	638,501
2023	610,870	1,593,595
2022	1,531,647	1,381,084
2021	1,324,280	1,065,424
2020	997,779	605,169
Prior	2,710,447	2,337,278
Revolving loans amortized cost basis	771,255	854,820
Revolving loans converted to term loans	45,412	44,899
Total	8,208,056	8,520,770
Pass [Member] \| Commercial Real Estate Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	129,875	1,315,563
2023	439,124	1,133,331
2022	1,273,312	885,590
2021	1,102,354	497,541
2020	840,945	447,991
Prior	2,347,375	2,041,329
Revolving loans amortized cost basis	181,405	171,223
Revolving loans converted to term loans	38,646	38,568
Total	6,353,036	6,531,136
Pass [Member] \| Construction [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	1,601	15,046
2023	2,956	22,288
2022	15,222	8,058
2021	22,301	0
2020	8,078	1,274
Prior		0
Revolving loans amortized cost basis		17,938
Revolving loans converted to term loans		0
Total	50,158	64,604
Pass [Member] \| SBA [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	17,018	48,212
2023	18,160	51,038
2022	47,462	29,306
2021	50,152	6,236
2020	24,211	20,701
Prior	97,627	101,856
Revolving loans amortized cost basis		0
Revolving loans converted to term loans		0
Total	254,630	257,349
Pass [Member] \| SBA - Paycheck Protection Program (PPP) [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023		699
2022		2,037
2021	478	0
2020	1,279	0
Prior		0
Revolving loans amortized cost basis		0
Revolving loans converted to term loans		0
Total	1,757	2,736
Pass [Member] \| Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	52,068	143,847
2023	126,396	100,059
2022	127,154	88,743
2021	77,749	68,352
2020	76,560	141,080
Prior	141,745	94,027
Revolving loans amortized cost basis	314,046	289,539
Revolving loans converted to term loans	5,625	5,460
Total	921,343	931,107
Pass [Member] \| Dairy and Livestock and Agribusiness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	225	296
2023		0
2022		1,586
2021	640	931
2020	903	80
Prior	216	208
Revolving loans amortized cost basis	240,963	337,525
Revolving loans converted to term loans		0
Total	242,947	340,626
Pass [Member] \| Municipal Lease Finance Receivables [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	792	0
2023		5,735
2022	5,374	25,803
2021	25,661	5,981
2020	5,604	4,267
Prior	33,317	31,622
Revolving loans amortized cost basis		0
Revolving loans converted to term loans		0
Total	70,748	73,408
Pass [Member] \| SFR Mortgage [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	12,199	22,248
2023	20,499	61,070
2022	60,288	43,573
2021	42,662	44,076
2020	39,738	28,049
Prior	89,239	67,750
Revolving loans amortized cost basis		0
Revolving loans converted to term loans		0
Total	264,625	266,766
Pass [Member] \| Consumer and Other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	2,588	4,911
2023	3,735	4,122
2022	2,835	2,707
2021	2,283	702
2020	461	644
Prior	928	486
Revolving loans amortized cost basis	34,841	38,595
Revolving loans converted to term loans	1,141	871
Total	48,812	53,038
Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	10,203	12,307
2023	13,125	6,262
2022	20,585	18,989
2021	22,994	25,622
2020	45,133	49,639
Prior	127,695	80,928
Revolving loans amortized cost basis	101,978	82,676
Revolving loans converted to term loans	7,349	5,520
Total	349,062	281,943
Special Mention [Member] \| Commercial Real Estate Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	9,500	3,897
2023	4,530	15,868
2022	17,874	19,368
2021	20,089	43,824
2020	38,870	3,241
Prior	121,598	74,673
Revolving loans amortized cost basis	1,828	2,911
Revolving loans converted to term loans	0	0
Total	214,289	163,782
Special Mention [Member] \| Construction [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024		0
2023		2,130
2022		0
2021		0
2020		0
Prior		0
Revolving loans amortized cost basis		0
Revolving loans converted to term loans		0
Total		2,130
Special Mention [Member] \| SBA [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024		1,627
2023		0
2022	1,606	4,784
2021		1,132
2020	4,752	0
Prior	2,907	1,760
Revolving loans amortized cost basis		0
Revolving loans converted to term loans		0
Total	9,265	9,303
Special Mention [Member] \| SBA - Paycheck Protection Program (PPP) [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	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]
2024	703	738
2023	7,431	745
2022	1,105	552
2021	2,721	4,114
2020	602	7,829
Prior	2,620	3,986
Revolving loans amortized cost basis	8,104	10,529
Revolving loans converted to term loans	6,877	5,347
Total	30,163	33,840
Special Mention [Member] \| Dairy and Livestock and Agribusiness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024		448
2023	417	0
2022		0
2021		0
2020		25
Prior		0
Revolving loans amortized cost basis	92,042	69,232
Revolving loans converted to term loans		0
Total	92,459	69,705
Special Mention [Member] \| Municipal Lease Finance Receivables [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024		0
2023		0
2022		0
2021		0
2020		0
Prior	141	182
Revolving loans amortized cost basis		0
Revolving loans converted to term loans		0
Total	141	182
Special Mention [Member] \| SFR Mortgage [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024		789
2023	747	0
2022		0
2021		918
2020	909	544
Prior	429	327
Revolving loans amortized cost basis		0
Revolving loans converted to term loans	299	0
Total	2,384	2,578
Special Mention [Member] \| Consumer and Other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024		0
2023		0
2022		246
2021	184	0
2020		0
Prior		0
Revolving loans amortized cost basis	4	4
Revolving loans converted to term loans	173	173
Total	361	423
Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024		744
2023	2,316	8,384
2022	9,542	2,891
2021	8,318	33,401
2020	26,095	13,824
Prior	58,149	35,423
Revolving loans amortized cost basis	16,643	5,789
Revolving loans converted to term loans	3,665	1,741
Total	124,728	102,197
Substandard [Member] \| Commercial Real Estate Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	8,127
2023	837	2,891
2022	9,267	33,401
2021	6,249	12,986
2020	26,095	744
Prior	53,438	30,637
Revolving loans amortized cost basis	1,714	801
Revolving loans converted to term loans	0	0
Total	97,600	89,587
Substandard [Member] \| Construction [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	0
2022	0	0
2021	2,069	0
2020	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	2,069	0
Substandard [Member] \| SBA [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	0
2022	0	0
2021	0	749
2020	0	0
Prior	4,043	3,218
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	4,043	3,967
Substandard [Member] \| SBA - Paycheck Protection Program (PPP) [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior	0	0
Revolving loans amortized cost basis		0
Revolving loans converted to term loans	0	0
Total		0
Substandard [Member] \| Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024		257
2023	1,479	0
2022	275	0
2021		89
2020		0
Prior	24	1,296
Revolving loans amortized cost basis	2,487	2,487
Revolving loans converted to term loans	413	819
Total	4,678	4,948
Substandard [Member] \| Dairy and Livestock and Agribusiness [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024		0
2023		0
2022		0
2021		0
2020		0
Prior	60	60
Revolving loans amortized cost basis	12,442	2,500
Revolving loans converted to term loans	2,654	0
Total	15,156	2,560
Substandard [Member] \| Municipal Lease Finance Receivables [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024		0
2023		0
2022		0
2021		0
2020		0
Prior		0
Revolving loans amortized cost basis		0
Revolving loans converted to term loans		0
Total		0
Substandard [Member] \| SFR Mortgage [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024		0
2023		0
2022		0
2021		0
2020		0
Prior	584	200
Revolving loans amortized cost basis		0
Revolving loans converted to term loans		324
Total	584	524
Substandard [Member] \| Consumer and Other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024		0
2023		0
2022		0
2021		0
2020		0
Prior		12
Revolving loans amortized cost basis		1
Revolving loans converted to term loans	598	598
Total	598	611
Doubtful & Loss [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024		0
2023		0
2022		0
2021		0
2020		0
Prior		0
Revolving loans amortized cost basis		0
Revolving loans converted to term loans		0
Total		0
Doubtful & Loss [Member] \| Commercial Real Estate Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024		0
2023		0
2022		0
2021		0
2020		0
Prior		0
Revolving loans amortized cost basis		0
Revolving loans converted to term loans		0
Total		0
Doubtful & Loss [Member] \| Construction [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024		0
2023		0
2022		0
2021		0
2020		0
Prior		0
Revolving loans amortized cost basis		0
Revolving loans converted to term loans		0
Total		0
Doubtful & Loss [Member] \| SBA [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2024		0
2023		0
2022		0
2021		0
2020		0
Prior		0
Revolving loans amortized cost basis		0
Revolving loans converted to term loans		0
Total		0
Doubtful & Loss [Member] \| SBA - Paycheck Protection Program (PPP) [Member]
Financing Receivable, Credit Quality Indicator [Line Items]

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