CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
OPERATING ACTIVITIES:
Net income	$ 146,278	$ 136,515	$ 60,776
Adjustments to reconcile net income to net cash provided from (used by) operating activities:
Depreciation	17,282	15,232	14,701
Deferred income and expense, net of amortization	(881)	(6,571)	1,972
Amortization of core deposit intangibles	8,151	6,047	6,246
(Gain) loss on sale of securities, net	(33)	837	2,080
Net change in valuation of financial instruments carried at fair value	208	(3,775)	2,844
Proceeds from sales of securities—trading	0	0	1,258
Principal repayments and maturities of securities—trading	0	100	1,849
Gain (Loss) on Sale of Branches, including loans and deposits	0	0	12,189
Decrease (increase) in deferred taxes	15,548	(3,498)	56,267
Increase (decrease) in current taxes payable	607	3,938	(2,965)
Equity-based compensation		6,554	5,965
Increase in cash surrender value of BOLI	(4,246)	(4,471)	(4,057)
Gain on sale of loans, net of capitalized servicing rights	(15,993)	(15,066)	(15,225)
Loss (gain) on disposal of real estate held for sale and property and equipment	1,075	(833)	(4,295)
PROVISION FOR LOAN LOSSES	10,000	8,500	8,000
Provision for real estate held for sale	0	387	256
Origination of loans held for sale	(1,094,237)	(896,461)	(807,137)
Proceeds from sales of loans held for sale	1,070,814	781,879	1,027,989
Net change in:
Other assets	(18,429)	(15,861)	2,546
Other liabilities	5,588	17,322	(179)
Net cash provided from operating activities	148,874	30,775	346,702
INVESTING ACTIVITIES:
Purchases of securities—available-for-sale	(277,503)	(913,951)	(838,247)
Principal repayments and maturities of securities—available-for-sale	321,510	173,454	187,080
Proceeds from sales of securities—available-for-sale	86,083	214,609	522,564
Purchases of securities—held-to-maturity	(54,850)	(9,612)	(6,490)
Principal repayments and maturities of securities—held-to-maturity	50,962	33,152	11,817
Loan originations, net of repayments	(304,191)	(416,218)	(288,951)
Purchases of loans and participating interest in loans	(9,798)	(33,680)	(126,508)
Proceeds from sales of other loans	27,560	9,853	21,923
Net cash paid related to branch divestiture	(26,944)	1,574
Net cash (paid) received from acquisitions and branch divestitures			113,222
Purchases of property and equipment	(24,700)	(23,094)	(12,244)
Proceeds from Sale of Property, Plant, and Equipment	7,815	7,768	20,121
Proceeds from FHLB stock repurchase program	175,998	143,175	118,304
Purchase of FHLB stock	(170,380)	(163,683)	(116,132)
Other	1,436	3,583	254
Net cash used by investing activities	(143,114)	(976,218)	(393,287)
FINANCING ACTIVITIES:
Increase in deposits, net	272,625	503,814	222,334
Proceeds from FHLBank Advance, Investing Activities	450,000	0	0
Repayment of long term FHLB borrowing	(280,415)	(10)	(9)
Advances, net of (repayments) of overnight and short-term FHLB borrowings	(300,000)	540,000	(54,000)
(Decrease) increase in other borrowings, net	(520)	7,870	(9,825)
Cash dividends paid	(56,074)	(59,280)	(65,759)
Cash paid for repurchase of common stock	(53,922)	(34,401)	(31,045)
Payment, Tax Withholding, Share-based Payment Arrangement	1,915	1,554	1,630
Net cash provided from financing activities	29,779	956,439	60,066
NET CHANGE IN CASH AND CASH EQUIVALENTS	35,539	10,996	13,481
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	272,196	261,200
CASH AND CASH EQUIVALENTS, END OF YEAR	307,735	272,196	261,200
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Interest paid in cash	58,239	28,098	18,875
Taxes paid in cash	27,329	21,664	35,500
NON-CASH INVESTING AND FINANCING TRANSACTIONS:
Loans, net of discounts, specific loss allowances and unearned income, transferred to real estate owned and other repossessed assets	303	1,645	10
Dividends accrued but not paid until after period end	51,199	13,778
ACQUISITIONS (DISPOSITIONS):
Assets Disposed			(259,398)
Assets acquired (disposed)	426,609	915,821
Liabilities assumed (transferred)	$ 373,016	$ 832,278
Liabilities Transfered			$ (160,465)