Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Interest Income
Loans	$ 204,964	$ 223,047	$ 198,226
Investment securities and other	12,739	11,947	7,723
Interest and Dividend Income, Operating	217,703	234,994	205,949
Interest Expense
Deposits	32,431	45,570	27,957
Federal Home Loan Bank advances	0	0	3,985
Short-term borrowings and repurchase agreements	675	3,635	765
Subordinated debentures issued to capital trust	628	1,019	953
Subordinated notes	6,831	4,378	4,097
Interest Expense	40,565	54,602	37,757
Provision for Loan Losses	15,871	6,150	7,150
Net Interest Income	177,138	180,392	168,192
Net Interest Income After Provision for Loan Losses	161,267	174,242	161,042
Noninterest Income
Commissions	892	889	1,137
Service charges, debit card and ATM fees	18,684	20,898	21,695
Net gains on loan sales	8,089	2,607	1,788
Net realized gains (losses) on sales of available-for-sale securities	78	(62)	2
Late charges and fees on loans	1,419	1,432	1,622
Gain (loss) on derivative interest rate products	(264)	(104)	25
Gain on sale of business units	0	0	7,414
Other income	6,152	5,297	2,535
Noninterest Income	35,050	30,957	36,218
Noninterest Expense
Salaries and employee benefits	70,810	63,224	60,215
Net occupancy and equipment expense	27,582	26,217	25,628
Postage	3,069	3,198	3,348
Insurance	2,405	2,015	2,674
Advertising	2,631	2,808	2,460
Office supplies and printing	1,016	1,077	1,047
Telephone	3,794	3,580	3,272
Legal, audit and other professional fees	2,378	2,624	3,423
Expense on other real estate and repossessions	2,023	2,184	4,919
Partnership tax credit investment amortization	80	365	575
Acquired deposit intangible asset amortization	1,154	1,190	1,562
Other operating expenses	6,283	6,656	6,187
Noninterest Expense	123,225	115,138	115,310
Income Before Income Taxes	73,092	90,061	81,950
Provision for Income Taxes	13,779	16,449	14,841
Net Income and Net Income Available to Common Shareholders	$ 59,313	$ 73,612	$ 67,109
Earnings Per Common Share
Basic	$ 4.22	$ 5.18	$ 4.75
Diluted	$ 4.21	$ 5.14	$ 4.71