Loans And Allowance For Credit Losses - Schedule of loans that are individually evaluated for credit losses (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable Impaired [Line Items]
Related Allowance	$ 17,870	$ 20,637
Total Recorded Investment	161,185	197,451
Collateral Pledged [Member]
Financing Receivable Impaired [Line Items]
Recorded Investment With No Allowance	19,955	21,439
Recorded Investment With Allowance	11,697	21,180
Related Allowance	4,184	3,419
Uncollateralized [Member]
Financing Receivable Impaired [Line Items]
Related Allowance	13,686	17,218
Total Recorded Investment	129,533	154,832
Commercial [Member]
Financing Receivable Impaired [Line Items]
Related Allowance	6,627	6,826
Total Recorded Investment	24,500	40,083
Commercial [Member] | Collateral Pledged [Member]
Financing Receivable Impaired [Line Items]
Recorded Investment With No Allowance	749	1,544
Recorded Investment With Allowance	4,621	3,471
Related Allowance	2,533	799
Commercial [Member] | Uncollateralized [Member]
Financing Receivable Impaired [Line Items]
Related Allowance	4,094	6,027
Total Recorded Investment	19,130	35,068
Commercial [Member] | C&I [Member]
Financing Receivable Impaired [Line Items]
Related Allowance	6,627	5,391
Total Recorded Investment	24,391	30,644
Commercial [Member] | C&I [Member] | Collateral Pledged [Member]
Financing Receivable Impaired [Line Items]
Recorded Investment With No Allowance	749	1,544
Recorded Investment With Allowance	4,621	3,471
Related Allowance	2,533	799
Commercial [Member] | C&I [Member] | Uncollateralized [Member]
Financing Receivable Impaired [Line Items]
Related Allowance	4,094	4,592
Total Recorded Investment	19,021	25,629
Commercial [Member] | Municipal [Member]
Financing Receivable Impaired [Line Items]
Related Allowance		1,435
Total Recorded Investment	109	9,439
Commercial [Member] | Municipal [Member] | Collateral Pledged [Member]
Financing Receivable Impaired [Line Items]
Recorded Investment With Allowance
Related Allowance
Commercial [Member] | Municipal [Member] | Uncollateralized [Member]
Financing Receivable Impaired [Line Items]
Related Allowance		1,435
Total Recorded Investment	109	9,439
Agricultural [Member]
Financing Receivable Impaired [Line Items]
Related Allowance	1,445	982
Total Recorded Investment	5,398	6,648
Agricultural [Member] | Collateral Pledged [Member]
Financing Receivable Impaired [Line Items]
Recorded Investment With No Allowance	3,026	470
Recorded Investment With Allowance	1,894	606
Related Allowance	1,086	96
Agricultural [Member] | Uncollateralized [Member]
Financing Receivable Impaired [Line Items]
Related Allowance	359	886
Total Recorded Investment	478	5,572
Real Estate [Member]
Financing Receivable Impaired [Line Items]
Related Allowance	9,793	12,821
Total Recorded Investment	129,157	148,256
Real Estate [Member] | Collateral Pledged [Member]
Financing Receivable Impaired [Line Items]
Recorded Investment With No Allowance	16,180	19,425
Recorded Investment With Allowance	4,629	16,602
Related Allowance	564	2,522
Real Estate [Member] | Uncollateralized [Member]
Financing Receivable Impaired [Line Items]
Related Allowance	9,229	10,299
Total Recorded Investment	108,348	112,229
Real Estate [Member] | Construction & Development [Member]
Financing Receivable Impaired [Line Items]
Related Allowance	225	652
Total Recorded Investment	5,473	15,205
Real Estate [Member] | Construction & Development [Member] | Collateral Pledged [Member]
Financing Receivable Impaired [Line Items]
Recorded Investment With No Allowance	102	1,176
Recorded Investment With Allowance	606	2,661
Related Allowance	90	35
Real Estate [Member] | Construction & Development [Member] | Uncollateralized [Member]
Financing Receivable Impaired [Line Items]
Related Allowance	135	617
Total Recorded Investment	4,765	11,368
Real Estate [Member] | Farm [Member]
Financing Receivable Impaired [Line Items]
Related Allowance	2	1,312
Total Recorded Investment	3,142	10,648
Real Estate [Member] | Farm [Member] | Collateral Pledged [Member]
Financing Receivable Impaired [Line Items]
Recorded Investment With No Allowance	997	2,614
Recorded Investment With Allowance	176	4,685
Related Allowance		654
Real Estate [Member] | Farm [Member] | Uncollateralized [Member]
Financing Receivable Impaired [Line Items]
Related Allowance	2	658
Total Recorded Investment	1,969	3,349
Real Estate [Member] | Non - Owner Occupied CRE [Member]
Financing Receivable Impaired [Line Items]
Related Allowance	4,059	1,921
Total Recorded Investment	34,468	22,626
Real Estate [Member] | Non - Owner Occupied CRE [Member] | Collateral Pledged [Member]
Financing Receivable Impaired [Line Items]
Recorded Investment With No Allowance	2,543	4,009
Recorded Investment With Allowance	128	1,234
Related Allowance	15	500
Real Estate [Member] | Non - Owner Occupied CRE [Member] | Uncollateralized [Member]
Financing Receivable Impaired [Line Items]
Related Allowance	4,044	1,421
Total Recorded Investment	31,797	17,383
Real Estate [Member] | Owner Occupied CRE [Member]
Financing Receivable Impaired [Line Items]
Related Allowance	3,481	5,829
Total Recorded Investment	48,504	62,730
Real Estate [Member] | Owner Occupied CRE [Member] | Collateral Pledged [Member]
Financing Receivable Impaired [Line Items]
Recorded Investment With No Allowance	6,548	7,279
Recorded Investment With Allowance	1,349	3,518
Related Allowance	152	657
Real Estate [Member] | Owner Occupied CRE [Member] | Uncollateralized [Member]
Financing Receivable Impaired [Line Items]
Related Allowance	3,329	5,172
Total Recorded Investment	40,607	51,933
Real Estate [Member] | Residential [Member]
Financing Receivable Impaired [Line Items]
Related Allowance	2,026	3,107
Total Recorded Investment	37,570	37,047
Real Estate [Member] | Residential [Member] | Collateral Pledged [Member]
Financing Receivable Impaired [Line Items]
Recorded Investment With No Allowance	5,990	4,347
Recorded Investment With Allowance	2,370	4,504
Related Allowance	307	676
Real Estate [Member] | Residential [Member] | Uncollateralized [Member]
Financing Receivable Impaired [Line Items]
Related Allowance	1,719	2,431
Total Recorded Investment	29,210	28,196
Consumer [Member]
Financing Receivable Impaired [Line Items]
Related Allowance	5	8
Total Recorded Investment	2,130	2,464
Consumer [Member] | Collateral Pledged [Member]
Financing Receivable Impaired [Line Items]
Recorded Investment With Allowance	553	501
Related Allowance	1	2
Consumer [Member] | Uncollateralized [Member]
Financing Receivable Impaired [Line Items]
Related Allowance	4	6
Total Recorded Investment	1,577	1,963
Consumer [Member] | Auto [Member]
Financing Receivable Impaired [Line Items]
Related Allowance	4	6
Total Recorded Investment	1,675	1,930
Consumer [Member] | Auto [Member] | Collateral Pledged [Member]
Financing Receivable Impaired [Line Items]
Recorded Investment With Allowance	514	407
Related Allowance	1	1
Consumer [Member] | Auto [Member] | Uncollateralized [Member]
Financing Receivable Impaired [Line Items]
Related Allowance	3	5
Total Recorded Investment	1,161	1,523
Consumer [Member] | Non - Auto [Member]
Financing Receivable Impaired [Line Items]
Related Allowance	1	2
Total Recorded Investment	455	534
Consumer [Member] | Non - Auto [Member] | Collateral Pledged [Member]
Financing Receivable Impaired [Line Items]
Recorded Investment With Allowance	39	94
Related Allowance		1
Consumer [Member] | Non - Auto [Member] | Uncollateralized [Member]
Financing Receivable Impaired [Line Items]
Related Allowance	1	1
Total Recorded Investment	$ 416	$ 440