Loans (Analysis of the Aged Loan Portfolio) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	$ 16,998	$ 23,041
Total Loans	11,322,387	10,641,937
Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	2,675	1,872
Total Loans	5,251,100	4,981,263
Commercial Business [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	9,947	13,321
Total Loans	3,646,956	3,423,268
Agriculture [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	3,216	5,396
Total Loans	853,099	795,715
Construction [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	0	0
Total Loans	482,211	384,755
One-to-Four Family Residential [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	1,140	2,433
Total Loans	1,042,190	1,013,908
Consumer Loan [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	20	19
Total Loans	46,831	43,028
Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	11,283,003	10,611,528
Financial Asset, Not Past Due \| Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	5,244,961	4,977,781
Financial Asset, Not Past Due \| Commercial Business [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	3,621,858	3,406,539
Financial Asset, Not Past Due \| Agriculture [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	849,483	789,112
Financial Asset, Not Past Due \| Construction [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	481,238	384,755
Financial Asset, Not Past Due \| One-to-Four Family Residential [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	1,038,770	1,010,343
Financial Asset, Not Past Due \| Consumer Loan [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	46,693	42,998
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	19,209	4,860
Financial Asset, 30 to 59 Days Past Due [Member] \| Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	1,281	0
Financial Asset, 30 to 59 Days Past Due [Member] \| Commercial Business [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	14,910	2,721
Financial Asset, 30 to 59 Days Past Due [Member] \| Agriculture [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	400	1,207
Financial Asset, 30 to 59 Days Past Due [Member] \| Construction [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	973	0
Financial Asset, 30 to 59 Days Past Due [Member] \| One-to-Four Family Residential [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	1,537	921
Financial Asset, 30 to 59 Days Past Due [Member] \| Consumer Loan [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	108	11
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	3,177	2,508
Financial Asset, 60 to 89 Days Past Due [Member] \| Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	2,183	1,610
Financial Asset, 60 to 89 Days Past Due [Member] \| Commercial Business [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	241	687
Financial Asset, 60 to 89 Days Past Due [Member] \| Agriculture [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Financial Asset, 60 to 89 Days Past Due [Member] \| Construction [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Financial Asset, 60 to 89 Days Past Due [Member] \| One-to-Four Family Residential [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	743	211
Financial Asset, 60 to 89 Days Past Due [Member] \| Consumer Loan [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	10	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Commercial Business [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Agriculture [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Construction [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| One-to-Four Family Residential [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Consumer Loan [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	22,386	7,368
Financial Asset, Past Due \| Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	3,464	1,610
Financial Asset, Past Due \| Commercial Business [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	15,151	3,408
Financial Asset, Past Due \| Agriculture [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	400	1,207
Financial Asset, Past Due \| Construction [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	973	0
Financial Asset, Past Due \| One-to-Four Family Residential [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	2,280	1,132
Financial Asset, Past Due \| Consumer Loan [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	$ 118	$ 11