CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net income	$ 53,582	$ 51,396
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	1,575	750
Depreciation of premises and equipment	2,478	2,454
Net amortization of premium and discount on securities and loans	3,113	2,157
Amortization of intangibles	714	740
Share-based compensation	2,295	1,977
Tax benefit from stock option exercises and other equity awards	202	454
Income from bank-owned life insurance	(1,784)	(1,624)
Net gains on loan sales and commissions on loans originated for others, including fair value adjustments	(10,749)	(7,950)
Net realized losses on securities	80	0
Proceeds from sales of loans	365,057	306,095
Loans originated for sale	(380,635)	(296,367)
(Increase) decrease in operating lease right-of-use assets	1,422	0
Increase (decrease) in operating lease liabilities	(1,312)	0
(Increase) decrease in other assets	(41,239)	(20,903)
Increase (decrease) in other liabilities	42,575	19,256
Net cash provided by (used in) operating activities	37,374	58,435
Cash flows from investing activities:
Purchases of mortgage-backed securities available for sale	(72,262)	(96,867)
Purchases of other investment securities available for sale	(10,507)	(30,964)
Proceeds from sale of other investment securities available for sale	9,920	0
Maturities and principal payments of mortgage-backed securities available for sale	96,521	63,918
Maturities and principal payments of other investment securities available for sale	51,135	6,795
Maturities and principal payments of mortgage-backed securities held to maturity	0	1,603
Remittance (purchases) of Federal Home Loan Bank stock	1,038	(4,008)
Net (increase) decrease in loans	(92,135)	(181,853)
Purchases of loans	(7,324)	(1,750)
Proceeds from the sale of property acquired through foreclosure or repossession	0	49
Purchases of premises and equipment	(2,768)	(2,320)
Purchases of bank-owned life insurance	0	(5,000)
Proceeds from surrender of bank-owned life insurance	326	0
Equity investment in real estate limited partnership	(1,256)	0
Net cash provided by (used in) investing activities	(27,312)	(250,397)
Cash flows from financing activities:
Net increase (decrease) in deposits	62,105	171,641
Proceeds from Federal Home Loan Bank advances	1,334,000	1,462,500
Repayment of Federal Home Loan Bank advances	(1,327,936)	(1,425,464)
Payment of contingent consideration liability	0	(1,217)
Net proceeds from stock option exercises and issuance of other equity awards	(280)	(714)
Cash dividends paid	(25,322)	(21,856)
Net cash provided by (used in) financing activities	42,567	184,890
Net increase (decrease) in cash and cash equivalents	52,629	(7,072)
Cash and cash equivalents at beginning of period	93,475	82,923
Cash and cash equivalents at end of period	146,104	75,851
Noncash Investing and Financing Activities:
Loans charged off	1,888	889
Loans transferred to property acquired through foreclosure or repossession	2,000	3,074
Operating lease right-of-use assets	28,923	0
Operating lease liabilities	30,853	0
Fair value of debt securities transferred from held-to-maturity to available for sale	10,316	0
Supplemental Disclosures:
Interest Payments	47,168	28,596
Income tax payments	$ 14,531	$ 12,585