CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash Flows from Operating Activities
Net income	$ 31,649	$ 22,817
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based and non-cash compensation	1,133	792
Depreciation	3,862	3,218
Amortization of intangible assets	2,389	1,875
Provision for loan losses	1,000	2,100
Provision for deferred income taxes	2,031	(4,621)
Amortization of security premiums and discounts, net	2,543	3,722
Accretion of premiums and discounts on time deposits and trust preferred securities, net	(198)	(237)
Accretion of premiums and discounts on portfolio loans, net	(3,270)	(1,962)
Net security gains	(853)	(1,219)
Gain on sales of mortgage loans, net of origination costs	(26,136)	(3,604)
Mortgage loans originated for sale	(758,338)	(531,235)
Proceeds from sales of mortgage loans	866,635	446,662
Net (gains) losses on disposition of premises and equipment	(56)	29
Increase in cash surrender value of bank owned life insurance	(888)	(678)
Change in assets and liabilities:
Decrease in other assets	7,879	7,184
Increase (decrease) in other liabilities	4,839	(1,997)
Increase (decrease) in interest payable	396	(43)
Decrease (increase) in income taxes receivable	523	(700)
Net cash provided by (used in) operating activities before activities	135,140	(57,897)
Cash Flows from Investing Activities
Proceeds from sales of securities classified available for sale	127,287	40,189
Proceeds from sales of securities classified held to maturity		399
Proceeds from maturities of securities classified available for sale	103,249	118,723
Proceeds from maturities of securities classified held to maturity	2,819	924
Purchase of securities classified available for sale	(116,327)	(70,686)
Purchase of securities classified held to maturity	(164,803)	(2,382)
Net (increase) decrease in portfolio loans	(32,403)	76,883
Proceeds from disposition of premises and equipment	611	845
Proceeds from sale of other real estate owned ("OREO") properties	3,765	1,389
Purchases of premises and equipment	(6,054)	(4,682)
Net cash received in acquisitions		25,575
Proceeds from the redemption of Federal Home Loan Bank ("FHLB") stock	6,001	9,960
Purchase of FHLB stock		(9,288)
Net cash (used in) provided by investing activities	(75,855)	187,849
Cash Flows from Financing Activities
Net decrease in certificates of deposit	(64,286)	(71,071)
Net increase (decrease) in demand, money market and savings deposits	84,468	(61,280)
Net decrease in securities sold under agreements to repurchase	(10,560)	(22,086)
Repayment of short-term borrowings	(25,000)	(12,800)
Repayment of long-term debt		(4,906)
Net proceeds from issuance of senior debt	39,351
Net proceeds from issuance of subordinated debt	59,022
Cash dividends paid	(13,764)	(9,759)
Value of shares surrendered upon vesting to satisfy tax withholding obligations of stock-based compensation	(1,259)	(12)
Proceeds from stock options exercised	137
Common stock issuance costs		(246)
Net cash provided by (used in) financing activities	68,109	(182,160)
Net increase (decrease) in cash and cash equivalents	127,394	(52,208)
Cash and cash equivalents, beginning of period	166,706	319,280
Cash and cash equivalents, ending of period	294,100	267,072
Cash Payments for:
Interest	6,162	4,205
Income taxes	13,116	9,300
Non-cash investing and financing activities:
Real estate acquired in settlement of loans	$ 258	$ 1,343