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Allowance for Credit Losses and Allowance for Unfunded Commitments and Letters of Credit (Allowance for Credit Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss	$ 146,949	$ 148,294	$ 155,578	$ 149,140
Financing Receivable, Allowance for Credit Loss, Writeoff	(1,901)	(3,466)
Financing Receivable, Allowance for Credit Loss, Recovery	1,072	3,420
Recapture for credit losses	(7,800)	(800)
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss	57,307	57,050	61,254	68,934
Financing Receivable, Allowance for Credit Loss, Writeoff	0	0
Financing Receivable, Allowance for Credit Loss, Recovery	14	36
Recapture for credit losses	(3,961)	(11,920)
Commercial Business [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss	50,474	58,405	54,712	45,250
Financing Receivable, Allowance for Credit Loss, Writeoff	(1,632)	(3,339)
Financing Receivable, Allowance for Credit Loss, Recovery	291	3,214
Recapture for credit losses	(2,897)	13,280
Agriculture [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss	8,010	9,487	8,148	9,052
Financing Receivable, Allowance for Credit Loss, Writeoff	(23)	0
Financing Receivable, Allowance for Credit Loss, Recovery	125	12
Recapture for credit losses	(240)	423
Construction [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss	5,399	6,551	5,397	7,636
Financing Receivable, Allowance for Credit Loss, Writeoff	0	0
Financing Receivable, Allowance for Credit Loss, Recovery	8	46
Recapture for credit losses	(6)	(1,131)
One-to-Four Family Residential [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss	24,356	15,638	24,123	16,875
Financing Receivable, Allowance for Credit Loss, Writeoff	0	0
Financing Receivable, Allowance for Credit Loss, Recovery	294	51
Recapture for credit losses	(61)	(1,288)
Consumer Loan [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss	1,403	1,163	$ 1,944	$ 1,393
Financing Receivable, Allowance for Credit Loss, Writeoff	(246)	(127)
Financing Receivable, Allowance for Credit Loss, Recovery	340	61
Recapture for credit losses	$ (635)	$ (164)

X

- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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- Definition

Amount of increase in allowance for credit loss on financing receivable from recovery.

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Amount of expense related to estimated loss from loan and lease transactions.

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