Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating activities:
Net Income	$ 60,076	$ 45,970
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	6,901	7,862
Depreciation of premises and equipment, net	6,454	5,587
Amortization of fees and discounts, net	15,002	13,921
Amortization of intangible assets	2,352	1,260
Gain on mortgage banking activities, net	(4,785)	(6,025)
Gain on sale of securities, net	(1,764)	(1,890)
Loss on sale of other real estate owned and valuation adjustments, net	187	230
Debt extinguishment cost	(695)	0
Deferred income tax expense	3,097	5,364
Increase in accrued interest receivable	(762)	(239)
(Increase) decrease in other assets	(7,451)	8,028
Origination of loans held for sale	(258,962)	(252,368)
Proceeds from sales of loans held for sale	284,797	230,864
Stock-based compensation expense	2,449	2,253
Increase in accrued interest payable	2,731	2,857
Increase (decrease) in other liabilities	962	(2,286)
Increase in value of bank owned life insurance	(899)	(2,311)
Increase in capitalized interest, net	(3,252)	(3,834)
Net cash provided by operating activities	107,828	55,243
Investing activities:
Purchases of investment securities held to maturity	0	(3,329)
Repayments, maturities and calls of investment securities held to maturity	1,175	2,840
Sale of investment securities available for sale	415,486	155,789
Purchases of investment securities available for sale	(593,878)	(254,993)
Repayments of investment securities available for sale	174,251	62,798
Proceeds of bank owned life insurance death benefit	371	0
Net increase in loans	(231,955)	(141,500)
Net cash for business combinations	0	51,788
Redemptions of stock of Federal Home Loan Bank of Pittsburgh	(128,159)	(57,308)
Redemptions of stock of Federal Home Loan Bank of Pittsburgh	133,130	51,117
Sales of other real estate owned	4,405	4,069
Investment in premises and equipment	(7,336)	(7,677)
Sales of premises and equipment	1,593	0
Net cash used for investing activities	(230,917)	(136,406)
Financing activities:
Net increase in demand and saving deposits	320,784	221,336
Decrease in time deposits	(36,055)	(57,383)
Increase (decrease) in brokered deposits	35,079	(12,091)
Decrease in loan payable	(359)	(366)
Receipts from FHLB advances	109,432,123	90,314,153
Repayments of FHLB advances	(109,588,547)	(90,166,500)
Receipts from federal funds purchased and securities sold under agreement to repurchase	17,610,000	21,676,620
Repayments of federal funds purchased and securities sold under agreement to repurchase	(17,670,000)	(21,723,820)
Dividends paid	(6,600)	(5,437)
Issuance of common stock and exercise of common stock options	2,317	1,918
Redemption of senior debt	(55,000)	0
Issuance of senior debt	0	97,849
Purchase of treasury stock	(9,211)	(12,890)
Net cash provided by financing activities	34,531	333,389
(Decrease) increase in cash and cash equivalents	(88,558)	252,226
Cash and cash equivalents at beginning of period	821,923	561,179
Cash and cash equivalents at end of period	733,365	813,405
Supplemental Disclosure of Cash Flow Information:
Interest	21,893	13,238
Income taxes	20,861	18,640
Non-cash information:
Loans transferred to other real estate owned	4,925	1,455
Loans transferred to portfolio from held-for-sale at fair value	12,782	6,337
Net change in accumulated other comprehensive income	4,494	13,163
Fair value of assets acquired, net of cash received	0	526,767
Fair value of liabilities assumed	0	583,517
Goodwill adjustments, net	$ (1,532)	$ (1,496)