Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest Income
Loans	$ 223,047	$ 198,226	$ 176,654
Investment securities and other	11,947	7,723	6,407
Interest and Dividend Income, Operating	234,994	205,949	183,061
Interest Expense
Deposits	45,570	27,957	20,595
Federal Home Loan Bank advances	0	3,985	1,516
Short-term borrowings and repurchase agreements	3,635	765	747
Subordinated debentures issued to capital trust	1,019	953	949
Subordinated notes	4,378	4,097	4,098
Interest Expense	54,602	37,757	27,905
Net Interest Income	180,392	168,192	155,156
Provision for Loan Losses	6,150	7,150	9,100
Net Interest Income After Provision for Loan Losses	174,242	161,042	146,056
Noninterest Income
Commissions	889	1,137	1,041
Service charges and ATM fees	20,898	21,695	21,628
Net gains on loan sales	2,607	1,788	3,150
Net realized gains (losses) on sales of available-for-sale securities	(62)	2	0
Late charges and fees on loans	1,432	1,622	2,231
Gain (loss) on derivative interest rate products	(104)	25	28
Gain on sale of business units	0	7,414	0
Gain (loss) on termination of loss sharing agreements	0	0	7,705
Amortization of income/expense related to business acquisitions	0	0	(486)
Other income	5,297	2,535	3,230
Noninterest Income	30,957	36,218	38,527
Noninterest Expense
Salaries and employee benefits	63,224	60,215	60,034
Net occupancy expense	26,217	25,628	24,613
Postage	3,198	3,348	3,461
Insurance	2,015	2,674	2,959
Advertising	2,808	2,460	2,311
Office supplies and printing	1,077	1,047	1,446
Telephone	3,580	3,272	3,188
Legal, audit and other professional fees	2,624	3,423	2,862
Expense on other real estate and repossessions	2,184	4,919	3,929
Partnership Tax Credit Investment Amortization	365	575	930
Acquired deposit intangible asset amortization	1,190	1,562	1,650
Other operating expenses	6,656	6,187	6,878
Noninterest Expense	115,138	115,310	114,261
Income Before Income Taxes	90,061	81,950	70,322
Provision for Income Taxes	16,449	14,841	18,758
Net Income and Net Income Available to Common Shareholders	$ 73,612	$ 67,109	$ 51,564
Earnings Per Common Share
Basic	$ 5.18	$ 4.75	$ 3.67
Diluted	$ 5.14	$ 4.71	$ 3.64