Loans, Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Jan. 01, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 2,946,395		$ 2,660,532
ACL Allocation	38,980	$ 38,260	35,470	$ 35,590	$ 35,940	$ 37,070	$ 37,070
Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	13,754,000		16,468,000
Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		0
Equipment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	263,000		165,000
Other Collateral [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		0
Total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	14,017,000		16,633,000
ACL Allocation	704,000		384,000
Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	98,555		106,933
ACL Allocation	2,470	2,265	2,261	2,118	2,055		2,508
Agricultural | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	552,000		734,000
Agricultural | Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		0
Agricultural | Equipment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		54,000
Agricultural | Other Collateral [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		0
Agricultural | Total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	552,000		788,000
ACL Allocation	295,000		1,000
Commercial and Financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	248,179		222,002
ACL Allocation	5,196	5,194	4,269	4,348	4,802		4,885
Commercial and Financial | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,271,000		1,951,000
Commercial and Financial | Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		0
Commercial and Financial | Equipment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	83,000		111,000
Commercial and Financial | Other Collateral [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		0
Commercial and Financial | Total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,354,000		2,062,000
ACL Allocation	4,000		189,000
Real Estate Construction One to Four Family Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	89,379		80,486
Real Estate Construction One to Four Family Residential [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	105,000		111,000
Real Estate Construction One to Four Family Residential [Member] | Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		0
Real Estate Construction One to Four Family Residential [Member] | Equipment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		0
Real Estate Construction One to Four Family Residential [Member] | Other Collateral [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		0
Real Estate Construction One to Four Family Residential [Member] | Total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	105,000		111,000
ACL Allocation	55,000		111,000
Real Estate: Construction, land development and commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	165,431		127,021
Real Estate: Construction, land development and commercial [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	287,000		492,000
Real Estate: Construction, land development and commercial [Member] | Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		0
Real Estate: Construction, land development and commercial [Member] | Equipment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		0
Real Estate: Construction, land development and commercial [Member] | Other Collateral [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		0
Real Estate: Construction, land development and commercial [Member] | Total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	287,000		492,000
ACL Allocation	0		13,000
Real Estate: Mortgage, farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	248,103		232,744
ACL Allocation	2,862	$ 3,330	3,433	$ 4,663	$ 4,904		$ 4,173
Real Estate: Mortgage, farmland | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,507,000		1,277,000
Real Estate: Mortgage, farmland | Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		0
Real Estate: Mortgage, farmland | Equipment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	180,000		0
Real Estate: Mortgage, farmland | Other Collateral [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		0
Real Estate: Mortgage, farmland | Total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,687,000		1,277,000
ACL Allocation	0		0
Real Estate: Mortgage, 1 to 4 family first liens [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,060,888		909,564
Real Estate: Mortgage, 1 to 4 family first liens [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	5,433,000		5,967,000
Real Estate: Mortgage, 1 to 4 family first liens [Member] | Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		0
Real Estate: Mortgage, 1 to 4 family first liens [Member] | Equipment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		0
Real Estate: Mortgage, 1 to 4 family first liens [Member] | Other Collateral [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		0
Real Estate: Mortgage, 1 to 4 family first liens [Member] | Total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	5,433,000		5,967,000
ACL Allocation	40,000		31,000
Real Estate: Mortgage, 1 to 4 family junior liens [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	118,326		114,342
Real Estate: Mortgage, 1 to 4 family junior liens [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	204,000		220,000
Real Estate: Mortgage, 1 to 4 family junior liens [Member] | Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		0
Real Estate: Mortgage, 1 to 4 family junior liens [Member] | Equipment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		0
Real Estate: Mortgage, 1 to 4 family junior liens [Member] | Other Collateral [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		0
Real Estate: Mortgage, 1 to 4 family junior liens [Member] | Total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	204,000		220,000
ACL Allocation	2,000		18,000
Real Estate: Mortgage, multi-family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	435,666		382,792
Real Estate: Mortgage, multi-family [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	625,000		1,460,000
Real Estate: Mortgage, multi-family [Member] | Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		0
Real Estate: Mortgage, multi-family [Member] | Equipment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		0
Real Estate: Mortgage, multi-family [Member] | Other Collateral [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		0
Real Estate: Mortgage, multi-family [Member] | Total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	625,000		1,460,000
ACL Allocation	0		0
Real Estate: Mortgage, commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	397,048		401,377
Real Estate: Mortgage, commercial [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	3,770,000		4,236,000
Real Estate: Mortgage, commercial [Member] | Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		0
Real Estate: Mortgage, commercial [Member] | Equipment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		0
Real Estate: Mortgage, commercial [Member] | Other Collateral [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		0
Real Estate: Mortgage, commercial [Member] | Total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	3,770,000		4,236,000
ACL Allocation	308,000		1,000
Loans to individuals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	35,355		32,687
Loans to individuals [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		20,000
Loans to individuals [Member] | Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		0
Loans to individuals [Member] | Equipment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		0
Loans to individuals [Member] | Other Collateral [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		0
Loans to individuals [Member] | Total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		20,000
ACL Allocation	0		20,000
Obligations of state and political subdivisions [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	49,191		50,285
Obligations of state and political subdivisions [Member] | Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		0
Obligations of state and political subdivisions [Member] | Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		0
Obligations of state and political subdivisions [Member] | Equipment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		0
Obligations of state and political subdivisions [Member] | Other Collateral [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		0
Obligations of state and political subdivisions [Member] | Total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	0		0
ACL Allocation	$ 0		$ 0