Parent Company Financial Statements (Condensed Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
ASSETS
Other Investments	$ 353	$ 353
Segment Assets	5,608,539	4,977,577	$ 4,397,672
LIABILITIES
Debt and Lease Obligation	152,183	194,529
TOTAL LIABILITIES	4,940,080	4,352,868
SHAREHOLDERS’ EQUITY
Common Stock, no par value, $1 stated value; 45,000,000 shares authorized	26,554	26,502
Additional Paid-in Capital	276,057	274,385
Retained Earnings	350,364	288,447
Accumulated Other Comprehensive Income (Loss)	15,484	35,375
TOTAL SHAREHOLDERS’ EQUITY	668,459	624,709	$ 573,820	$ 458,640
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	5,608,539	4,977,577
Parent Company
ASSETS
Cash	86,391	47,533
Other Investments	353	353
Investment in Subsidiary Bank	616,459	614,661
Investment in Non-banking Subsidiaries	5,973	5,956
Other Assets	20,678	17,247
Segment Assets	729,854	685,750
LIABILITIES
Debt and Lease Obligation	55,804	55,400
Other Liabilities	5,591	5,641
TOTAL LIABILITIES	61,395	61,041
SHAREHOLDERS’ EQUITY
Common Stock, no par value, $1 stated value; 45,000,000 shares authorized	26,554	26,502
Additional Paid-in Capital	276,057	274,385
Retained Earnings	350,364	288,447
Accumulated Other Comprehensive Income (Loss)	15,484	35,375
TOTAL SHAREHOLDERS’ EQUITY	668,459	624,709
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$ 729,854	$ 685,750