Loans (Analysis of Loan Portfolio by Major Types of Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Credit Quality Indicator - narrative [Line Items]
Total loans, net of unearned income	$ 10,641,937	$ 9,427,660
Allowance for Credit Loss	(155,578)	(149,140)	$ (83,968)	$ (83,369)
Total loans, net	10,486,359	9,278,520
Commercial Real Estate
Financing Receivable, Credit Quality Indicator - narrative [Line Items]
Total loans, net of unearned income	4,981,263	4,062,313
Allowance for Credit Loss	(61,254)	(68,934)	(20,340)	(14,864)
Commercial Business
Financing Receivable, Credit Quality Indicator - narrative [Line Items]
Total loans, net of unearned income	3,423,268	3,597,968
Allowance for Credit Loss	(54,712)	(45,250)	(30,292)	(34,658)
Agriculture
Financing Receivable, Credit Quality Indicator - narrative [Line Items]
Total loans, net of unearned income	795,715	779,627
Allowance for Credit Loss	(8,148)	(9,052)	(15,835)	(9,589)
Construction
Financing Receivable, Credit Quality Indicator - narrative [Line Items]
Total loans, net of unearned income	384,755	268,663
Allowance for Credit Loss	(5,397)	(7,636)	(8,571)	(14,395)
Real estate: One-to-four family residential
Financing Receivable, Credit Quality Indicator - narrative [Line Items]
Total loans, net of unearned income	1,013,908	683,570
Allowance for Credit Loss	(24,123)	(16,875)	(7,435)	(8,024)
Consumer Loan
Financing Receivable, Credit Quality Indicator - narrative [Line Items]
Total loans, net of unearned income	43,028	35,519
Allowance for Credit Loss	$ (1,944)	$ (1,393)	$ (883)	$ (786)