Allowance for Credit Losses - Summary of Activity in Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 97,944	$ 86,062	$ 85,376	$ 91,847	$ 91,847
ACL on PCD Loans			2,037
Charge-offs	(267)	(1,582)	(1,411)	(2,195)	(2,392)
Recoveries	311	1,321	1,841	2,534	3,086
Provision for (Benefit from) Credit Losses	3,500	(1,495)	13,645	(7,880)	(7,165)
Ending  Balance	101,488	84,306	101,488	84,306	85,376
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning Balance	4,075	3,465	3,790	3,400	3,400
ACL on PCD Loans			0
Charge-offs	0	0	0	0	0
Recoveries	0	0	0	0	0
Provision for (Benefit from) Credit Losses	295	60	580	125	390
Ending  Balance	4,370	3,525	4,370	3,525	3,790
Credit Loss [Roll Forward]
Beginning Balance	102,019	89,527	89,166	95,247	95,247
ACL on PCD Loans			2,037
Charge-offs	(267)	(1,582)	(1,411)	(2,195)	(2,392)
Recoveries	311	1,321	1,841	2,534	3,086
Provision for (Benefit from) Credit Losses	3,795	(1,435)	14,225	(7,755)	(6,775)
Ending  Balance	105,858	87,831	105,858	87,831	89,166
Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	55,450	51,637	51,140	53,693	53,693
ACL on PCD Loans			1,573
Charge-offs	0	(144)	(294)	(144)	(144)
Recoveries	2	803	3	806	806
Provision for (Benefit from) Credit Losses	3,188	(1,567)	6,218	(3,626)	(3,215)
Ending  Balance	58,640	50,729	58,640	50,729	51,140
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	23,931	23,950	23,474	25,148	25,148
ACL on PCD Loans			144
Charge-offs	(185)	(326)	(470)	(605)	(751)
Recoveries	189	161	705	1,134	1,501
Provision for (Benefit from) Credit Losses	(3)	(294)	79	(2,186)	(2,424)
Ending  Balance	23,932	23,491	23,932	23,491	23,474
Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	9,979	4,511	3,862	4,252	4,252
ACL on PCD Loans			81
Charge-offs	(82)	(1,112)	(647)	(1,446)	(1,470)
Recoveries	119	355	1,130	570	755
Provision for (Benefit from) Credit Losses	384	(327)	5,974	51	325
Ending  Balance	10,400	3,427	10,400	3,427	3,862
Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	7,522	4,951	5,667	7,540	7,540
ACL on PCD Loans			201
Charge-offs	0	0	0	0	(27)
Recoveries	0	0	0	0	0
Provision for (Benefit from) Credit Losses	(1,390)	577	264	(2,012)	(1,846)
Ending  Balance	6,132	5,528	6,132	5,528	5,667
Agriculture production
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	1,046	1,007	1,215	1,209	1,209
ACL on PCD Loans			38
Charge-offs	0	0	0	0	0
Recoveries	1	2	3	24	24
Provision for (Benefit from) Credit Losses	1,321	110	1,112	(114)	(18)
Ending  Balance	2,368	1,119	2,368	1,119	1,215
Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	16	6	18	5	5
ACL on PCD Loans			0
Charge-offs	0	0	0	0	0
Recoveries	0	0	0	0	0
Provision for (Benefit from) Credit Losses	0	6	(2)	7	13
Ending  Balance	16	12	16	12	18
CRE non-owner occupied | Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	28,081	26,028	25,739	29,380	29,380
ACL on PCD Loans			746
Charge-offs	0	0	0	0	0
Recoveries	1	10	1	12	12
Provision for (Benefit from) Credit Losses	1,162	(817)	2,758	(4,171)	(3,653)
Ending  Balance	29,244	25,221	29,244	25,221	25,739
CRE owner occupied | Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	12,620	10,463	10,691	10,861	10,861
ACL on PCD Loans			63
Charge-offs	0	(18)	0	(18)	(18)
Recoveries	1	793	2	794	794
Provision for (Benefit from) Credit Losses	904	(508)	2,769	(907)	(946)
Ending  Balance	13,525	10,730	13,525	10,730	10,691
Multifamily | Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	11,795	13,196	12,395	11,472	11,472
ACL on PCD Loans			0
Charge-offs	0	0	0	0	0
Recoveries	0	0	0	0	0
Provision for (Benefit from) Credit Losses	954	(320)	354	1,404	923
Ending  Balance	12,749	12,876	12,749	12,876	12,395
Farmland | Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	2,954	1,950	2,315	1,980	1,980
ACL on PCD Loans			764
Charge-offs	0	(126)	(294)	(126)	(126)
Recoveries	0	0	0	0	0
Provision for (Benefit from) Credit Losses	168	78	337	48	461
Ending  Balance	3,122	1,902	3,122	1,902	2,315
SFR 1-4 1st DT liens | Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	10,311	10,629	10,723	10,117	10,117
ACL on PCD Loans			144
Charge-offs	0	(145)	0	(145)	(145)
Recoveries	38	1	79	12	13
Provision for (Benefit from) Credit Losses	322	133	(275)	634	738
Ending  Balance	10,671	10,618	10,671	10,618	10,723
SFR HELOCs and junior liens | Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	11,591	10,701	10,510	11,771	11,771
ACL on PCD Loans			0
Charge-offs	0	0	0	0	(29)
Recoveries	98	63	426	860	1,127
Provision for (Benefit from) Credit Losses	(306)	(333)	447	(2,200)	(2,359)
Ending  Balance	11,383	10,431	11,383	10,431	10,510
Other | Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	2,029	2,620	2,241	3,260	3,260
ACL on PCD Loans			0
Charge-offs	(185)	(181)	(470)	(460)	(577)
Recoveries	53	97	200	262	361
Provision for (Benefit from) Credit Losses	(19)	(94)	(93)	(620)	(803)
Ending  Balance	$ 1,878	$ 2,442	$ 1,878	$ 2,442	$ 2,241