CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash Flows from Operating Activities
Net income	$ 15,170	$ 10,434
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based and non-cash compensation	545	389
Depreciation	1,949	1,408
Amortization of intangible assets	1,207	766
Provision for loan losses	500	1,000
Provision for deferred income taxes	1,053	1,398
Amortization of security premiums and discounts, net	1,334	1,924
Accretion of premiums and discounts on time deposits and trust preferred securities, net	(99)
Accretion of premiums and discounts on portfolio loans, net	(1,748)	(247)
Net security gains	(857)	(1,067)
Gain on sales of mortgage loans, net of origination costs	(13,964)	(399)
Mortgage loans originated for sale	(325,525)	(35,677)
Proceeds from sales of mortgage loans	493,621	32,484
Net gains on disposition of premises and equipment	(4)	(9)
Increase in cash surrender value of bank owned life insurance	(348)	(194)
Change in assets and liabilities:
Decrease (increase) in other assets	14,372	(1,176)
Decrease in other liabilities	(6,943)	(3,022)
Decrease in interest payable	(94)	(15)
Decrease (increase) in income taxes receivable	6,401	(1,015)
Net cash provided by operating activities before activities	186,570	6,982
Cash Flows from Investing Activities
Proceeds from sales of securities classified available for sale	121,993	35,588
Proceeds from maturities of securities classified available for sale	47,872	49,608
Proceeds from maturities of securities classified held to maturity	874	503
Purchase of securities classified available for sale	(64,619)	(23,106)
Purchase of securities classified held to maturity	(43,126)
Net decrease in portfolio loans	13,396	52,060
Proceeds from disposition of premises and equipment	44	12
Proceeds from sale of other real estate owned ("OREO") properties	3,229	366
Purchases of premises and equipment	(2,095)	(1,235)
Proceeds from the redemption of Federal Home Loan Bank ("FHLB") stock	6,365
Net cash provided by investing activities	83,933	113,796
Cash Flows from Financing Activities
Net decrease in certificates of deposit	(23,588)	(16,717)
Net increase (decrease) in demand, money market and savings deposits	134,967	(90,661)
Repayment of short-term borrowings	(75,000)
Cash dividends paid	(6,879)	(4,879)
Value of shares surrendered upon vesting to satisfy tax withholding obligations of stock-based compensation	(1,259)	(10)
Proceeds from stock options exercised	137
Net decrease in securities sold under agreements to repurchase	(26,076)	(6,831)
Net cash provided by (used in) financing activities	2,302	(119,098)
Net increase in cash and cash equivalents	272,805	1,680
Cash and cash equivalents, beginning of period	166,706	319,280
Cash and cash equivalents, ending of period	439,511	320,960
Cash Payments for:
Interest	3,008	1,591
Income taxes	58	5,200
Non-cash investing and financing activities:
Real estate acquired in settlement of loans	$ 190	$ 41