Loans Receivable and the Allowance for Credit Losses - Activity in Allowance for Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Net charge-offs (recoveries)	$ 3,700	$ 6,600
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	49,200	48,700	$ 55,500
PCD allowance established in acquisition		3,371
Charge-offs	(4,552)	(7,656)	(2,332)
Recoveries	803	1,093	2,768
Credit loss expense	6,049	3,692	(7,236)
Ending balance	51,500	49,200	48,700
Credit loss expense, off balance sheet credit exposure	(200)	800	(100)
Loans Receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Accrued interest receivable	19,700	15,300
Agricultural
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	923	667	1,346
PCD allowance established in acquisition		512
Charge-offs	(28)	(326)	(170)
Recoveries	203	11	149
Credit loss expense	(485)	59	(658)
Ending balance	613	923	667
Commercial and Industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	22,855	17,294	15,689
PCD allowance established in acquisition		1,473
Charge-offs	(1,447)	(2,051)	(1,015)
Recoveries	373	682	1,604
Credit loss expense	(38)	5,457	1,016
Ending balance	21,743	22,855	17,294
Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	20,123	26,120	32,640
PCD allowance established in acquisition		1,227
Charge-offs	(2,337)	(4,328)	(602)
Recoveries	20	160	742
Credit loss expense	5,953	(3,056)	(6,660)
Ending balance	23,759	20,123	26,120
Residential Real Estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	4,678	4,010	4,882
PCD allowance established in acquisition		159
Charge-offs	(55)	(195)	(107)
Recoveries	27	86	88
Credit loss expense	112	618	(853)
Ending balance	4,762	4,678	4,010
Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	621	609	943
PCD allowance established in acquisition		0
Charge-offs	(685)	(756)	(438)
Recoveries	180	154	185
Credit loss expense	507	614	(81)
Ending balance	$ 623	$ 621	$ 609