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Loans Held for Investment and Allowance for Credit Losses - Schedule of Impaired Loans and Related Allowance (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]      
Unpaid Contractual Principal Balance $ 53,284 $ 38,336 $ 33,949
Recorded Investment With No Allowance 11,120 12,779 8,369
Recorded Investment With Allowance 28,106 15,729 16,213
Total Recorded Investment 39,226 28,508 24,582
Related Allowance 3,386 4,472 3,228
Average Recorded Investment 44,634 29,996 27,307
Commercial [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Contractual Principal Balance 7,300 10,227 4,511
Recorded Investment With No Allowance 992 6,129 630
Recorded Investment With Allowance 4,628 2,768 2,463
Total Recorded Investment 5,620 8,897 3,093
Related Allowance 1,271 1,184 1,042
Average Recorded Investment 6,409 9,292 3,488
Agriculture [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Contractual Principal Balance 1,340 892 1,603
Recorded Investment With No Allowance 632 179 658
Recorded Investment With Allowance 496 652 718
Total Recorded Investment 1,128 831 1,376
Related Allowance 98 130 235
Average Recorded Investment 1,200 859 1,644
Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Contractual Principal Balance 44,208 26,528 27,366
Recorded Investment With No Allowance 9,496 6,444 7,081
Recorded Investment With Allowance 22,660 11,810 12,706
Total Recorded Investment 32,156 18,254 19,787
Related Allowance 2,016 2,901 1,950
Average Recorded Investment 36,683 19,268 21,726
Consumer [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Contractual Principal Balance 436 689 469
Recorded Investment With No Allowance 0 27 0
Recorded Investment With Allowance 322 499 326
Total Recorded Investment 322 526 326
Related Allowance 1 257 1
Average Recorded Investment $ 342 $ 577 $ 449