Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net income attributable to the Company	$ 58,871	$ 54,075
Adjustments to arrive at net income from continuing operations [Abstract]
Net income attributable to noncontrolling interests	3,190	3,010
Less: Net income from discontinued operations	(3,881)	(4,357)
Net income from continuing operations	58,180	52,728
Adjustments to reconcile net income from continuing operations to net cash provided by/(used in) operating activities:
Depreciation and amortization	15,835	16,997
Net income attributable to noncontrolling interests	3,190	3,010
Stock compensation, net of cancellations	6,183	2,186
Provision/ (credit) for loan losses	(6,727)	(5,806)
Loans originated for sale	(38,099)	(61,768)
Proceeds from sale of loans held for sale	39,972	65,086
Deferred income tax expense/ (benefit)	4,141	3,721
Net decrease/ (increase) in other operating activities	(9,407)	(2,134)
Net cash provided by/ (used in) operating activities of continuing operations	66,888	68,000
Net cash provided by/ (used in) operating activities of discontinued operations	3,881	4,357
Net cash provided by/ (used in) operating activities	70,769	72,357
Investment securities available for sale:
Purchases	(138,623)	(323,271)
Sales	119,238	41,961
Maturities, calls, redemptions, and principal payments	100,065	131,245
Purchases	14,945	0
Maturities and principal payments	23,541	16,907
(Investments)/ distributions in trusts, net	(747)	(539)
Purchase of additional Bank Owned Life Insurance (BOLI)	(50,000)	0
(Purchase)/ redemption of Federal Home Loan Bank and Federal Reserve Bank stock	(17,637)	(903)
Net (increase)/ decrease in portfolio loans	(298,304)	(156,688)
Proceeds from recoveries of loans previously charged-off	4,082	8,347
Proceeds from sale of OREO	1,644	1,337
Capital expenditures, net of sale proceeds	(10,769)	(7,099)
Net cash provided by/ (used in) investing activities of continuing operations	(282,455)	(288,703)
Net cash provided by/ (used in) investing activities	(282,455)	(288,703)
Cash flows from financing activities:
Net increase/ (decrease) in deposits	177,201	(122,406)
Net increase/ (decrease) in securities sold under agreements to repurchase	279	19,251
Net increase/ (decrease) in federal funds purchased	(10,000)	125,000
Net increase/ (decrease) in short-term Federal Home Loan Bank borrowings	110,000	95,000
Advances of long-term Federal Home Loan Bank borrowings	50,110	67,179
Repayments of long-term Federal Home Loan Bank borrowings	(81,542)	(100,822)
Dividends paid to common shareholders	(27,739)	(24,940)
Dividends paid to preferred shareholders	(2,606)	(2,606)
Proceeds from warrant exercises	1,879	0
Repurchase of common stock	0	(8,020)
Tax benefit/ (deficiency) from certain stock compensation awards	0	(728)
Proceeds from stock option exercises	827	789
Proceeds from issuance of common stock, net	632	841
Distributions paid to noncontrolling interests	(3,197)	(2,905)
Other equity adjustments	(275)	(350)
Net cash provided by/ (used in) financing activities of continuing operations	215,569	45,283
Net cash provided by/ (used in) financing activities	215,569	45,283
Net increase/ (decrease) in cash and cash equivalents	3,883	(171,063)
Cash and cash equivalents at beginning of year	106,557	238,694
Cash and cash equivalents at end of period	110,440	67,631
Supplementary schedule of non-cash investing and financing activities:
Cash paid for interest	23,681	20,489
Cash paid for income taxes, (net of refunds received)	32,051	27,554
Change in unrealized gain/ (loss) on available-for-sale securities, net of tax	7,295	11,992
Change in unrealized gain/ (loss) on cash flow hedges, net of tax	418	(358)
Change in unrealized gain/ (loss) on other, net of tax	12	0
Loans transferred into other real estate owned from loan portfolio	0	1,944
Loans charged-off	(559)	(3,372)
Premises and equipment transferred into/ (out of) other assets held for sale	0	891
Deposits transferred into/(out of) held for sale	$ 0	$ 105,788