Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating Activities
Net income	$ 93,072	$ 63,110
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	21,935	26,795
Depreciation of premises, furniture, and equipment	8,093	7,584
Net amortization of premium on securities	6,609	7,738
Gains on sales of 1-4 family mortgages and corporate loans held-for-sale	(3,391)	(3,134)
Net (gains) losses on sales and valuation adjustments of OREO	(1,169)	493
Amortization of the FDIC indemnification asset	604	604
Net losses on sales and valuation adjustments of premises, furniture, and equipment	1,252	5,449
BOLI income	(3,645)	(2,877)
Share-based compensation expense	6,863	6,196
Tax benefit related to share-based compensation	160	158
Amortization of other intangible assets	4,987	3,596
Originations of mortgage loans held-for-sale	(164,398)	(114,142)
Proceeds from sales of mortgage loans held-for-sale	154,191	130,900
Net increase in equity securities	(2,918)	(586)
Net decrease in accrued interest receivable and other assets	19,027	8,072
Net (decrease) increase in accrued interest payables and other liabilities	(36,151)	16,100
Net cash provided by operating activities	105,121	156,056
Investing Activities
Proceeds from maturities, repayments, and calls of securities available-for-sale	167,502	154,136
Proceeds from sales of securities available-for-sale	93,332	0
Purchases of securities available-for-sale	(460,066)	(462,071)
Proceeds from maturities, repayments, and calls of securities held-to-maturity	3,162	718
Purchases of securities held-to-maturity	(2,837)	0
Net purchases of FHLB stock	(27,683)	(13,070)
Net increase in loans	(394,713)	(479,514)
Premiums paid on BOLI, net of proceeds from claims	3,260	113
Proceeds from sales of OREO	5,236	8,638
Proceeds from sales of premises, furniture, and equipment	2,291	150
Purchases of premises, furniture, and equipment	(10,360)	(16,891)
Net cash paid for acquisition	(13,532)	0
Net cash used in investing activities	(634,408)	(807,791)
Financing Activities
Net increase in deposit accounts	117,722	438,938
Net increase in borrowed funds	499,553	266,160
Purchase of treasury stock	(21,190)	0
Cash dividends paid	(25,636)	(21,619)
Restricted stock activity	(3,770)	(4,047)
Net cash provided by financing activities	566,679	679,432
Net increase in cash and cash equivalents	37,392	27,697
Cash and cash equivalents at beginning of period	289,258	346,570
Cash and cash equivalents at end of period	326,650	374,267
Supplemental Disclosures of Cash Flow Information:
Income taxes paid (refunded)	16,948	(18,898)
Interest paid to depositors and creditors	47,750	25,056
Dividends declared, but unpaid	15,377	11,248
Stock issued for acquisitions, net of issuance costs	101,496	0
Non-cash transfers of loans to OREO	322	1,172
Non-cash transfers of loans to other assets	13,175	0
Non-cash transfers of loans held-for-investment to loans held-for-sale	4,762	9,546
Non-cash transfer of trading securities and securities available-for-sale to equity securities	0	$ 27,855
Non-cash recognition of right-of-use asset/liability	$ 143,561