Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest Income
Loans, including fees	$ 737,932	$ 683,042	$ 603,961
Investment securities:
Taxable	62,556	56,039	47,028
Tax-exempt	14,218	12,076	11,566
Dividends	0	5	369
Loans held for sale	1,351	1,159	876
Other interest income	9,249	6,193	5,066
Total Interest Income	825,306	758,514	668,866
Interest Expense
Deposits	131,775	87,712	57,791
Short-term borrowings	14,543	8,489	2,779
Long-term debt	30,599	31,857	32,932
Total Interest Expense	176,917	128,058	93,502
Net Interest Income	648,389	630,456	575,364
Provision for credit losses	32,825	46,907	23,305
Net Interest Income After Provision for Credit Losses	615,564	583,549	552,059
Non-Interest Income
Non-interest income before investment securities gains	211,427	195,488	198,903
Investment securities gains, net	4,733	37	9,071
Total Non-Interest Income	216,160	195,525	207,974
Non-Interest Expense
Salaries and employee benefits	311,934	303,202	290,130
Net occupancy	52,826	51,678	49,708
Data processing and software	44,679	41,286	38,735
Other outside services	39,989	33,758	27,501
Equipment	13,575	13,243	12,935
Professional	13,134	14,161	12,688
Federal Deposit Insurance Corporation (FDIC)	7,780	10,993	11,049
Amortization of tax credit investments	6,021	11,449	11,028
Prepayment penalty on Federal Home Loan Bank (FHLB) advances	4,326	0	0
Intangible amortization	1,427	0	0
Other	72,045	66,334	71,805
Total Non-Interest Expense	567,736	546,104	525,579
Income Before Income Taxes	263,988	232,970	234,454
Income taxes	37,649	24,577	62,701
Net Income	$ 226,339	$ 208,393	$ 171,753
PER COMMON SHARE:
Net Income (Basic) (usd per share)	$ 1.36	$ 1.19	$ 0.98
Net Income (Diluted) (usd per share)	1.35	1.18	0.98
Cash Dividends (usd per share)	$ 0.56	$ 0.52	$ 0.47
Commercial banking
Non-Interest Income
Non-interest income before investment securities gains	$ 71,117	$ 63,929	$ 65,730
Consumer banking
Non-Interest Income
Non-interest income before investment securities gains	49,503	48,422	48,918
Investment management and trust services
Non-Interest Income
Non-interest income before investment securities gains	55,678	52,148	49,249
Mortgage banking
Non-Interest Income
Non-interest income before investment securities gains	23,099	19,026	19,928
Other
Non-Interest Income
Non-interest income before investment securities gains	$ 12,030	$ 11,963	$ 15,078