Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating activities
Net income	$ 70,536	$ 49,256
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Provision for loan losses	3,560	3,250
Depreciation, amortization and accretion	1,854	2,625
Deferred income tax expense	3,476	2,219
Funding of mortgage loans held for sale	(838,564)	(772,456)
Proceeds from sales of mortgage loans held for sale	721,351	729,532
Gains on sales of mortgage loans held for sale	(19,517)	(11,608)
Penalty on prepayment of debt	0	205
(Gains) losses on sales of premises and equipment	(225)	546
Stock-based compensation expense	3,712	2,411
(Increase) decrease in other assets	(6,649)	10,428
Decrease in other liabilities	(12,657)	(8,715)
Net cash (used in) provided by operating activities	(73,123)	7,693
Investing activities
Purchases of securities available for sale	(497,845)	(119,766)
Proceeds from sales of securities available for sale	0	2,946
Proceeds from call/maturities of securities available for sale	63,655	60,928
Proceeds from call/maturities of securities held to maturity	0	15,507
Net increase in loans	(140,205)	(163,349)
Purchases of premises and equipment	(10,313)	(7,668)
Proceeds from sales of premises and equipment	233	1,255
Proceeds from sales of other assets	4,026	7,385
Net cash used in investing activities	(580,449)	(202,762)
Financing activities
Net increase in noninterest-bearing deposits	48,137	81,506
Net increase in interest-bearing deposits	413,003	62,405
Net increase in short-term borrowings	223,579	10,445
Repayment of long-term debt	(436)	(11,063)
Cash paid for dividends	(19,413)	(16,068)
Net stock-based compensation transactions	201	(2,319)
Net cash provided by financing activities	665,071	124,906
Net increase (decrease) in cash and cash equivalents	11,499	(70,163)
Cash and cash equivalents at beginning of period	281,453	306,224
Cash and cash equivalents at end of period	292,952	236,061
Supplemental disclosures
Cash paid for interest	24,652	16,155
Cash paid for income taxes	12,044	12,701
Noncash transactions:
Transfers of loans to other real estate owned	2,291	4,227
Financed sales of other real estate owned	418	257
Transfers of loans held for sale to loans held for investment	$ 663	$ 0