Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Operating activities:
Net Income	$ 33,248	$ 25,123
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	2,034	4,559
Depreciation of premises and equipment, net	3,699	3,054
Amortization of fees and discounts, net	8,239	7,173
Amortization of intangible assets	1,015	787
Increase in accrued interest receivable	(124)	(490)
(Increase) decrease in other assets	(2,440)	271
Origination of loans held-for-sale	(152,484)	(185,543)
Proceeds from sales of loans held-for-sale	160,686	168,397
Gain on mortgage banking activities, net	(3,470)	(3,293)
Gain on sale of securities, net	(850)	(928)
Stock-based compensation expense	1,480	2,345
Increase in accrued interest payable	1,272	875
(Increase) decrease in other liabilities	(473)	1,582
Loss on sale of other real estate owned and valuation adjustments, net	162	201
Deferred income tax expense	3,821	1,836
Increase in value of bank-owned life insurance	(1,283)	(430)
Increase in capitalized interest, net, on reverse mortgage loans	(2,688)	(2,405)
Net cash provided by operating activities	51,844	23,114
Investing activities:
Purchases of investment securities held-to-maturity	(3,329)
Maturities and calls of investment securities held-to-maturity	1,810	3,486
Sale of investment securities available-for-sale	101,348	84,529
Purchases of investment securities available-for-sale	(159,684)	(185,463)
Repayments of investment securities available-for-sale	35,570	55,084
Repayments on reverse mortgages	2,696	6,196
Disbursements for reverse mortgages	(987)	(438)
Net increase in loans	(76,288)	(149,214)
Net (increase) decrease in stock of FHLB	(7,420)	(8,554)
Sales of assets acquired through foreclosure, net	2,657	3,081
Investment in premises and equipment, net	(3,870)	(2,884)
Net cash used for investing activities	(107,497)	(194,177)
Financing activities:
Net increase (decrease) in demand and saving deposits	17,446	(38,091)
Decrease in time deposits	(46,594)	(77,906)
Increase (decrease) in brokered deposits	2,396	(3,336)
(Decrease) increase in loan payable	(386)	41
Receipts from FHLB advances	57,591,203	14,455,050
Repayments of FHLB advances	(57,373,950)	(14,435,200)
Receipts from federal funds purchased and securities sold under agreement to repurchase	16,434,870	30,479,478
Repayments of federal funds purchased and securities sold under agreement to repurchase	(16,512,070)	(30,169,691)
Dividends paid	(3,556)	(2,823)
Issuance of common stock and exercise of common stock options	1,723	1,845
Issuance of Senior Debt	98,319
Purchase of treasury stock	(11,034)	(12,652)
Net cash provided by financing activities	198,367	196,715
Increase in cash and cash equivalents	142,714	25,652
Cash and cash equivalents at beginning of period	561,179	508,039
Cash and cash equivalents at end of period	703,893	533,691
Supplemental Disclosure of Cash Flow Information:
Cash paid for interest during the period	8,507	7,124
Cash paid for income taxes, net	12,493	10,471
Loans transferred to other real estate owned	674	2,452
Loans transferred to portfolio from held-for-sale at fair value	3,670	171
Net change in accumulated other comprehensive income	14,981	(2,271)
Non-cash goodwill adjustments, net	$ (360)	$ 336