Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating activities:
Net Income	$ 134,743	$ 50,244	$ 64,080
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	13,170	10,964	12,986
Depreciation of premises and equipment, net	8,329	8,557	7,477
Amortization of fees and discounts, net	15,255	19,082	19,626
Amortization of intangible assets	2,942	3,078	2,438
Income from mortgage banking activities, net	(6,286)	(6,293)	(7,434)
Gain on sale of debt securities, net	(21)	(1,984)	(2,369)
Gain on sale of equity investments, net	(3,757)	0	0
Loss on sale of other real estate owned and valuation adjustments, net	100	217	313
Stock-based compensation expense	2,292	3,396	3,046
Unrealized gain on equity investments	(20,745)	0	0
Debt extinguishment costs	0	695	0
Deferred income tax expense	3,378	17,899	5,370
Increase in accrued interest receivable	(2,596)	(2,378)	(2,009)
(Increase) decrease in other assets	(6,297)	(2,517)	443
Origination of loans held for sale	(351,108)	(354,659)	(366,859)
Proceeds from sales of loans held for sale	352,002	369,986	346,895
Increase (decrease) in accrued interest payable	863	(114)	350
(Decrease) increase in other liabilities	(2,931)	7,353	3,709
Provision for legal settlement	0	12,000	0
Increase in value of bank-owned life insurance	(158)	(1,130)	(2,551)
Increase in capitalized interest, net	(3,601)	(4,228)	(5,331)
Net cash provided by operating activities	135,574	130,168	80,180
Investing activities:
Purchases of investment securities held to maturity	0	0	(3,329)
Repayments, maturities and calls of investment securities held to maturity	9,245	1,230	2,890
Sales of investment securities available for sale	7,012	457,046	201,580
Purchases of investment securities available for sale	(498,465)	(696,581)	(371,590)
Repayments of investment securities available for sale	112,665	197,765	85,200
Proceeds of bank-owned life insurance death benefits	0	371	0
Proceeds from bank-owned life insurance surrender	96,429	0	0
Net cash for business combinations	0	0	39,794
Purchases of Visa Class B shares	(101,174)	(343,858)	(217,572)
Net increase in loans	(1,568)	(10,072)	(387)
Sale of Visa Class B shares	6,186	0	0
Purchases of stock of Federal Home Loan Bank of Pittsburgh	(169,613)	(160,089)	(88,176)
Redemptions of stock of Federal Home Loan Bank of Pittsburgh	181,638	167,053	80,447
Sales of other real estate owned	3,037	6,077	4,423
Investment in premises and equipment	(5,500)	(7,728)	(9,873)
Sales of premises and equipment	198	0	0
Net cash used for investing activities	(359,910)	(388,786)	(276,593)
Financing activities:
Net increase in demand and savings deposits	393,827	353,521	272,544
Net increase (decrease) in time deposits	43,871	35,887	(51,416)
Net (decrease) increase in brokered deposits	(31,712)	90,482	(17,928)
Decrease in loan payable	0	(338)	(370)
Receipts from FHLB advances	83,721,532	143,852,751	121,977,563
Repayments of FHLB advances	(84,103,068)	(143,996,986)	(121,792,841)
Receipts from federal funds purchased and securities sold under agreement to repurchase	21,239,675	23,008,000	27,702,620
Repayments of federal funds purchased and securities sold under agreement to repurchase	(21,109,700)	(23,110,000)	(27,700,820)
Repayment of long-term debt	0	0	(10,000)
Dividends paid	(13,249)	(9,425)	(7,632)
Issuance of common stock and exercise of common stock options	11,253	3,421	1,900
Repayment of senior debt	0	(55,000)	0
Issuance of senior debt	0	0	97,849
Purchase of treasury stock	(31,202)	(11,752)	(14,312)
Net cash provided by financing activities	121,227	160,561	457,157
(Decrease) increase in cash and cash equivalents	(103,109)	(98,057)	260,744
Cash and cash equivalents at beginning of year	723,866	821,923	561,179
Cash and cash equivalents at end of year	620,757	723,866	821,923
Supplemental disclosure of cash flow information:
Interest	45,636	33,569	22,483
Income taxes	33,316	31,441	24,825
Non-cash information:
Loans transferred to other real estate owned	3,302	5,206	2,251
Loans transferred to portfolio from held-for-sale at fair value	9,553	13,142	12,919
Non-cash information:	0	0	534,375
Loans transferred to other real estate owned	0	0	589,632
Fair value of assets acquired, net of cash received	$ 0	$ (1,532)	$ 2,112