Revenue Recognition Transition Adjustments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net securities gains	$ 5,262	$ (49)	$ 8,102	$ 603
Fees and Commissions on Trust and Fiduciary Accounts	1,880	1,711	3,808	3,128
Fees and Commissions on Depositor Accounts	4,423	4,736	8,829	9,055
Insurance and retail brokerage commissions	(1,820)	(2,442)	(3,688)	(4,524)
Income from bank owned life insurance	2,168	1,449	3,662	2,741
Gain on sale of mortgage loans	1,241	1,315	2,725	2,292
Gain on sale of other loans and assets	2,331	457	2,905	764
Fees and Commissions on Debit Cards	5,143	4,842	9,885	9,093
Derivatives mark to market	0	(37)	789	(35)
Derivative Fee Income	297	314	587	241
Other income	(1,743)	(1,724)	(3,371)	(3,430)
Noninterest Income	(26,308)	(18,904)	(48,351)	(35,836)
Salaries and employee benefits	(26,154)	(25,298)	(51,027)	(48,764)
Net occupancy expense	4,222	4,121	8,591	7,882
Furniture and equipment expense	3,647	3,323	7,187	6,411
Data processing expense	(2,478)	(2,345)	(4,911)	(4,430)
Marketing and Advertising Expense	1,176	988	1,985	1,794
Pennsylvania shares tax expense	1,247	1,161	2,150	1,977
Intangible amortization	829	846	1,613	1,418
Collection and repossession expense	607	443	1,430	940
Other professional fees and services	1,031	1,096	2,038	2,055
FDIC insurance	597	977	1,373	1,770
Loss on sale or write-down of assets	497	1,220	694	1,319
Litigation and operational losses	197	277	376	509
Conversion Related Expenses	1,273	9,870	1,610	10,481
Other operating expenses	(5,174)	(6,298)	(11,017)	(11,278)
Noninterest Expense	(49,129)	$ (58,263)	(96,002)	$ (101,028)
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net securities gains	5,262		8,102
Fees and Commissions on Trust and Fiduciary Accounts	1,880		3,808
Fees and Commissions on Depositor Accounts	4,423		8,829
Insurance and retail brokerage commissions	(2,493)		(4,741)
Income from bank owned life insurance	2,168		3,662
Gain on sale of mortgage loans	1,241		2,725
Gain on sale of other loans and assets	2,331		2,905
Fees and Commissions on Debit Cards	5,143		9,885
Derivatives mark to market	0		789
Derivative Fee Income	297		587
Other income	(1,990)		(3,844)
Noninterest Income	(27,228)		(49,877)
Salaries and employee benefits	(26,827)		(52,080)
Net occupancy expense	4,222		8,591
Furniture and equipment expense	3,647		7,187
Data processing expense	(2,575)		(5,084)
Marketing and Advertising Expense	1,176		1,985
Pennsylvania shares tax expense	1,247		2,150
Intangible amortization	829		1,613
Collection and repossession expense	607		1,430
Other professional fees and services	1,031		2,038
FDIC insurance	597		1,373
Loss on sale or write-down of assets	497		694
Litigation and operational losses	197		376
Conversion Related Expenses	1,273		1,610
Other operating expenses	(5,324)		(11,317)
Noninterest Expense	(50,049)		(97,528)
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	(673)		(1,053)
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	(247)		(473)
Noninterest Income	(920)		(1,526)
Salaries and employee benefits	(673)		(1,053)
Net occupancy expense	0		0
Furniture and equipment expense	0		0
Data processing expense	(97)		(173)
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	(150)		(300)
Noninterest Expense	(920)		(1,526)
Net Impact of Topic 606	$ 0		$ 0