Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest Income
Loans, including fees	$ 683,042	$ 603,961	$ 543,385
Investment securities:
Taxable	56,039	47,028	44,975
Tax-exempt	12,076	11,566	9,662
Dividends	5	369	571
Loans held for sale	1,159	876	728
Other interest income	6,193	5,066	3,779
Total Interest Income	758,514	668,866	603,100
Interest Expense
Deposits	87,712	57,791	44,693
Short-term borrowings	8,489	2,779	855
Long-term debt	31,857	32,932	36,780
Total Interest Expense	128,058	93,502	82,328
Net Interest Income	630,456	575,364	520,772
Provision for credit losses	46,907	23,305	13,182
Net Interest Income After Provision for Credit Losses	583,549	552,059	507,590
Non-Interest Income
Revenue from Contract with Customer, Including Assessed Tax	195,488	198,903	187,628
Investment securities gains, net	37	9,071	2,550
Total Non-Interest Income	195,525	207,974	190,178
Non-Interest Expense
Salaries and employee benefits	303,202	290,130	283,353
Net occupancy expense	51,678	49,708	47,611
Other outside services	33,758	27,501	23,883
Equipment expense	41,286	38,735	36,919
Amortization of tax credit investments	11,449	11,028	0
Marketing	13,243	12,935	12,788
Loss on redemption of trust preferred securities	14,161	12,688	11,004
FDIC insurance expense	10,993	11,049	9,767
State taxes	9,590	10,051	6,405
Other Noninterest Expense	56,744	61,754	57,789
Total Non-Interest Expense	546,104	525,579	489,519
Income Before Income Taxes	232,970	234,454	208,249
Income taxes	24,577	62,701	46,624
Net Income	$ 208,393	$ 171,753	$ 161,625
PER COMMON SHARE:
Net Income (Basic) (usd per share)	$ 1.19	$ 0.98	$ 0.93
Net Income (Diluted) (usd per share)	1.18	0.98	0.93
Cash Dividends (usd per share)	$ 0.52	$ 0.47	$ 0.41
Other service charges and fees
Non-Interest Income
Revenue from Contract with Customer, Including Assessed Tax	$ 53,777	$ 52,859	$ 51,473
Service charges on deposit accounts
Non-Interest Income
Revenue from Contract with Customer, Including Assessed Tax	48,889	51,006	51,346
Investment management and trust services
Non-Interest Income
Revenue from Contract with Customer, Including Assessed Tax	52,148	49,249	45,270
Mortgage banking income
Non-Interest Income
Revenue from Contract with Customer, Including Assessed Tax	19,026	19,928	19,415
Other
Non-Interest Income
Revenue from Contract with Customer, Including Assessed Tax	$ 21,648	$ 25,861	$ 20,124