Revenue Recognition Transition Adjustments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net securities gains	$ 0	$ 92	$ 8,102	$ 695
Fees and Commissions on Trust and Fiduciary Accounts	2,206	2,147	6,014	5,275
Fees and Commissions on Depositor Accounts	4,589	4,803	13,418	13,858
Insurance and retail brokerage commissions	(1,872)	(2,128)	(5,560)	(6,652)
Income from bank owned life insurance	1,579	1,472	5,241	4,213
Gain on sale of mortgage loans	1,542	1,418	4,267	3,710
Gain on sale of other loans and assets	643	503	3,548	1,267
Fees and Commissions on Debit Cards	5,044	4,780	14,929	13,873
Derivatives mark to market	0	(14)	789	(49)
Derivative Fee Income	528	217	1,115	458
Other income	(1,754)	(2,244)	(5,125)	(5,674)
Noninterest Income	(19,757)	(19,790)	(68,108)	(55,626)
Salaries and employee benefits	(26,553)	(26,169)	(77,580)	(74,933)
Net occupancy expense	4,341	3,715	12,932	11,597
Furniture and equipment expense	3,424	3,342	10,611	9,753
Data processing expense	(2,853)	(2,229)	(7,764)	(6,659)
Marketing and Advertising Expense	1,200	941	3,185	2,735
Pennsylvania shares tax expense	1,248	1,093	3,398	3,070
Intangible amortization	817	844	2,430	2,262
Collection and repossession expense	630	402	2,060	1,342
Other professional fees and services	962	1,300	3,000	3,355
FDIC insurance	217	696	1,590	2,466
Loss on sale or write-down of assets	181	167	875	1,486
Litigation and operational losses	435	598	811	1,107
Conversion Related Expenses	24	(69)	1,634	10,412
Other operating expenses	(6,645)	(5,934)	(17,662)	(17,212)
Noninterest Expense	(49,530)	$ (47,361)	(145,532)	$ (148,389)
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net securities gains	0		8,102
Fees and Commissions on Trust and Fiduciary Accounts	2,206		6,014
Fees and Commissions on Depositor Accounts	4,589		13,418
Insurance and retail brokerage commissions	(2,531)		(7,272)
Income from bank owned life insurance	1,579		5,241
Gain on sale of mortgage loans	1,542		4,267
Gain on sale of other loans and assets	643		3,548
Fees and Commissions on Debit Cards	5,044		14,929
Derivatives mark to market	0		789
Derivative Fee Income	528		1,115
Other income	(2,033)		(5,877)
Noninterest Income	(20,695)		(70,572)
Salaries and employee benefits	(27,212)		(79,292)
Net occupancy expense	4,341		12,932
Furniture and equipment expense	3,424		10,611
Data processing expense	(2,983)		(8,067)
Marketing and Advertising Expense	1,200		3,185
Pennsylvania shares tax expense	1,248		3,398
Intangible amortization	817		2,430
Collection and repossession expense	630		2,060
Other professional fees and services	962		3,000
FDIC insurance	217		1,590
Loss on sale or write-down of assets	181		875
Litigation and operational losses	435		811
Conversion Related Expenses	24		1,634
Other operating expenses	(6,794)		(18,111)
Noninterest Expense	(50,468)		(147,996)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net securities gains	0		0
Fees and Commissions on Trust and Fiduciary Accounts	0		0
Fees and Commissions on Depositor Accounts	0		0
Insurance and retail brokerage commissions	(659)		(1,712)
Income from bank owned life insurance	0		0
Gain on sale of mortgage loans	0		0
Gain on sale of other loans and assets	0		0
Fees and Commissions on Debit Cards	0		0
Derivatives mark to market	0		0
Derivative Fee Income	0		0
Other income	(279)		(752)
Noninterest Income	(938)		(2,464)
Salaries and employee benefits	(659)		(1,712)
Net occupancy expense	0		0
Furniture and equipment expense	0		0
Data processing expense	(130)		(303)
Marketing and Advertising Expense	0		0
Pennsylvania shares tax expense	0		0
Intangible amortization	0		0
Collection and repossession expense	0		0
Other professional fees and services	0		0
FDIC insurance	0		0
Loss on sale or write-down of assets	0		0
Litigation and operational losses	0		0
Conversion Related Expenses	0		0
Other operating expenses	(149)		(449)
Noninterest Expense	(938)		(2,464)
Net Impact of Topic 606	$ 0		$ 0