CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net income		$ 69,118	$ 68,432	$ 45,925
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses		1,575	1,550	2,600
Depreciation of premises and equipment		3,291	3,282	3,454
Net amortization of premiums and discounts on securities and loans		4,492	2,865	3,426
Amortization of intangibles		943	979	1,035
Goodwill impairment		0	0	150
Share–based compensation		3,124	2,602	2,577
Tax benefit from stock option exercises and other equity awards		248	496	508
Deferred income tax (benefit) expense		(1,491)	(63)	5,687
Income from bank-owned life insurance	[1]	(2,354)	(2,196)	(2,161)
Net gains on loan sales, including fair value adjustments		(14,332)	(9,749)	(10,991)
Net realized losses on securities	[1]	53	0	0
Proceeds from sales of loans, net		530,713	391,960	472,556
Loans originated for sale		(525,675)	(378,896)	(461,262)
Change in fair value of contingent consideration liability		0	(187)	(643)
Decrease in operating lease right-of-use assets		2,131	0	0
Decrease in operating lease liabilities		(1,992)	0	0
Increase in other assets		(27,961)	(7,456)	(8,794)
Increase in other liabilities		31,552	9,257	5,318
Net cash provided by (used in) operating activities		73,435	82,876	59,385
Cash flows from investing activities:
Purchases of mortgage-backed available for sale debt securities		(178,797)	(175,539)	(89,194)
Purchases of other available for sale debt securities		(27,520)	(76,264)	(59,940)
Proceeds from sale of other available for sale debt securities		11,877	0	0
Maturities and principal payments of mortgage-backed available for sale debt securities		147,620	83,197	84,381
Maturities and principal payments of other available for sale debt securities		108,306	7,301	22,071
Maturities and principal payments of mortgage-backed held to maturity debt securities		0	2,029	2,950
(Purchases) remittance of Federal Home Loan Bank stock		(4,785)	(5,551)	2,612
Net increase in loans		(154,502)	(306,299)	(120,582)
Purchases of loans		(60,465)	(1,780)	(20,278)
Proceeds from the sale of property acquired through foreclosure or repossession		2,000	49	1,053
Purchases of premises and equipment		(3,132)	(3,974)	(2,779)
Proceeds from sale of premises		213	0	0
Purchases of bank-owned life insurance		0	(5,000)	0
Proceeds from bank-owned life insurance		326	0	0
Equity investment in real estate limited partnership		(1,256)	0	0
Net cash provided by (used in) investing activities		(160,115)	(481,831)	(179,706)
Cash flows from financing activities:
Net (decrease) increase in deposits		(25,166)	281,341	178,955
Proceeds from Federal Home Loan Bank advances		1,982,000	2,040,000	1,352,501
Repayment of Federal Home Loan Bank advances		(1,791,258)	(1,880,634)	(1,410,075)
Payment of contingent consideration liability		0	(1,217)	0
Net proceeds from stock option exercises and issuance of other equity awards, net of awards surrendered		273	(671)	366
Cash dividends paid		(34,189)	(29,312)	(26,300)
Net cash provided by (used in) financing activities		131,660	409,507	95,447
Net increase (decrease) in cash and cash equivalents		44,980	10,552	(24,874)
Cash and cash equivalents at beginning of year		93,475	82,923	107,797
Cash and cash equivalents at end of year		138,455	93,475	82,923
Noncash Activities:
Loans charged-off		2,020	1,187	2,462
Loans transferred to property acquired through foreclosure or repossession		2,000	3,074	576
Operating lease right-of-use assets		28,923	0	0
Operating lease liabilities		30,853	0	0
Fair value of held-to-maturity securities transferred to available for sale		10,316	0	0
Supplemental Disclosures:
Interest payments		64,496	41,285	29,687
Income tax payments		$ 19,759	$ 17,148	$ 25,988

[1] As reported in the Consolidated Statements of Income.