Consolidated Balance Sheets - USD ($) shares in Thousands, $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
ASSETS
Cash and Due from Banks	$ 218,899	$ 223,541
Interest-earning deposits with banks	434,867	24,132
Total cash and cash equivalents	653,766	247,673
Debt Securities, Available-for-sale	5,210,134	3,746,142
Equity Securities	13,425	0
Federal Home Loan Bank stock at cost	10,280	48,120
Loans held for sale	26,481	17,718
Loans, net of unearned income	9,427,660	8,743,465
Less: ACL	149,140	83,968
Loans, net	9,278,520	8,659,497
Interest receivable		46,839
Premises and equipment, net	162,059	165,408
Other real estate owned	553	552
Goodwill	765,842	765,842
Other intangible assets, net	26,734	35,458
Other assets	382,154	346,275
Total Assets	16,584,779	14,079,524
LIABILITIES AND SHAREHOLDERS' EQUITY
Noninterest-bearing deposits	6,913,214	5,328,146
Interest-bearing deposits	6,956,648	5,356,562
Total deposits	13,869,862	10,684,708
Federal Home Loan Bank advances	7,414	953,469
Securities sold under agreements to repurchase	73,859	64,437
Subordinated Debentures	35,092	35,277
Other liabilities	250,945	181,671
Total liabilities	$ 14,237,172	$ 11,919,562
Preferred Stock, Authorized shares	2,000	2,000
Common stock, Authorized shares	115,000	115,000
Common Stock Shares Issued	73,782	73,577
Common Stock (no par value)	$ 1,660,998	$ 1,650,753
Common Stock Shares Outstanding	71,598	72,124
Retained earnings	$ 575,248	$ 519,676
Accumulated Other Comprehensive Income, Net of Tax	$ 182,195	$ 40,367
Treasury Stock, Shares	2,184	1,453
Treasury Stock, Value	$ (70,834)	$ (50,834)
Total shareholders' equity	2,347,607	2,159,962
Total Liabilities and Shareholders' Equity	16,584,779	14,079,524
U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations
ASSETS
Debt Securities, Available-for-sale	3,814,387	2,892,950
Asset-backed Securities
ASSETS
Debt Securities, Available-for-sale	357,479	196,050
Loans, net	9,278,520
State and Municipal Securities
ASSETS
Debt Securities, Available-for-sale	753,572	488,802
Interest receivable	54,831
US Government Corporations and Agencies Securities [Member]
ASSETS
Debt Securities, Available-for-sale	284,696	$ 168,340
Premises and equipment, net	$ 162,059