CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
OPERATING ACTIVITIES:
Net income	$ 27,469	$ 20,017
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization (accretion) on investment securities, net	(106)	138
Accretion on loans and amortization of core deposit intangible, net	(702)	(583)
Unrealized losses on equity securities with readily determinable fair value	182
Depreciation of premises and equipment	2,447	2,042
Amortization of mortgage servicing rights	362	353
Provision for loan and lease losses	17,255	12,351
Net gain on sale of mortgage loans held for sale	(777)	(977)
Origination of mortgage loans held for sale	(29,410)	(33,245)
Proceeds from sale of mortgage loans held for sale	31,452	40,691
Net gain on sale of consumer loans held for sale	(1,637)	(1,108)
Origination of consumer loans held for sale	(164,496)	(126,924)
Proceeds from sale of consumer loans held for sale	167,562	126,441
Net gain realized on sale of other real estate owned	(132)	(212)
Writedowns of other real estate owned		70
Impairment of premises held for sale	104	58
Deferred director compensation expense - Class A Common Stock	55	55
Stock based compensation expense	152	410
Increase in cash surrender value of bank owned life insurance	(371)	(391)
Net change in other assets and liabilities:
Accrued interest receivable	310	209
Accrued interest payable	(59)	(90)
Other assets	(97)	(2,096)
Other liabilities	2,439	8,700
Net cash provided by operating activities	52,002	45,909
INVESTING ACTIVITIES:
Purchases of available-for-sale debt securities	(69,940)	(54,390)
Proceeds from calls, maturities and paydowns of available-for-sale debt securities	174,255	10,017
Proceeds from calls, maturities and paydowns of held-to-maturity debt securities	1,375	1,002
Net change in outstanding warehouse lines of credit	(8,387)	90,274
Purchase of non-business acquisition loans, including premiums paid		(1,224)
Net change in other loans	(37,155)	8,800
Proceeds from sales of other real estate owned	266	501
Net purchases of premises and equipment	(3,738)	(3,193)
Net cash provided by investing activities	56,676	51,787
FINANCING ACTIVITIES:
Net change in deposits	284,465	188,092
Net change in securities sold under agreements to repurchase and other short-term borrowings	(28,339)	(29,098)
Payments of Federal Home Loan Bank advances	(347,500)	(435,000)
Proceeds from Federal Home Loan Bank advances	50,000	100,000
Repurchase of Class A Common Stock		(544)
Net proceeds from Class A Common Stock options exercised		33
Cash dividends paid	(4,533)	(4,301)
Net cash used in financing activities	(45,907)	(180,818)
NET CHANGE IN CASH AND CASH EQUIVALENTS	62,771	(83,122)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	299,351	289,309
CASH AND CASH EQUIVALENTS AT END OF PERIOD	362,122	206,187
Cash paid during the period for:
Interest	6,227	4,535
Income taxes	365	331
SUPPLEMENTAL NONCASH DISCLOSURES:
Transfers from loans to real estate acquired in settlement of loans	$ 179	$ 330