Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income attributable to the Company	$ 29,120	$ 39,068
Adjustments to arrive at net income from continuing operations [Abstract]
Net income attributable to noncontrolling interests	(2,018)	(2,116)
Less: Net income from discontinued operations	(1,696)	(2,695)
Net income from continuing operations	29,442	38,489
Adjustments to reconcile net income from continuing operations to net cash provided by/(used in) operating activities:
Depreciation and amortization	11,200	10,575
Net income attributable to noncontrolling interests	(2,018)	(2,116)
Stock compensation, net of cancellations	3,399	4,137
Provision/ (credit) for loan losses	(1,342)	(6,295)
Loans originated for sale	(24,260)	(19,814)
Proceeds from sale of loans held for sale	24,486	20,605
Deferred income tax expense/ (benefit)	8,374	1,240
Net decrease/ (increase) in other operating activities	(17,613)	(6,434)
Net cash provided by/ (used in) operating activities of continuing operations	31,668	40,387
Net cash provided by/ (used in) operating activities of discontinued operations	1,696	2,695
Net cash provided by/ (used in) operating activities	33,364	43,082
Investment securities available for sale:
Purchases	(32,659)	(99,647)
Sales	35,550	103,031
Maturities, calls, redemptions, and principal payments	65,712	78,610
Purchases	11,876	14,945
Principal payments	7,288	8,745
(Investments)/ distributions in trusts, net	(329)	(514)
Purchase of additional Bank Owned Life Insurance (BOLI)	0	(50,000)
(Purchase)/ redemption of Federal Home Loan Bank and Federal Reserve Bank stock	(10,154)	(1,491)
Net (increase)/ decrease in portfolio loans	(263,692)	(165,426)
Proceeds from recoveries of loans previously charged-off	593	3,748
Proceeds from sale of OREO	0	1,644
Capital expenditures, net of sale proceeds	(14,453)	(6,298)
Proceeds from sale of affiliate	34,120	0
Net cash provided by/ (used in) investing activities	(189,900)	(142,543)
Cash flows from financing activities:
Net increase/ (decrease) in deposits	109,933	296,193
Net increase/ (decrease) in securities sold under agreements to repurchase	26,655	(30,392)
Net increase/ (decrease) in federal funds purchased	(30,000)	(40,000)
Net increase/ (decrease) in short-term Federal Home Loan Bank borrowings	350,000	(90,000)
Advances of long-term Federal Home Loan Bank borrowings	91,444	46,235
Repayments of long-term Federal Home Loan Bank borrowings	(78,187)	(71,451)
Payments for redemption of Series D preferred stock	(50,000)	0
Dividends paid to common shareholders	(20,330)	(18,452)
Dividends paid to preferred shareholders	(1,738)	(1,738)
Proceeds from warrant exercises	21	1,877
Proceeds from stock option exercises	1,257	804
Proceeds from issuance of common stock, net	(1,059)	(248)
Distributions paid to noncontrolling interests	(1,958)	(2,064)
Other equity adjustments	4,496	(828)
Net cash provided by/ (used in) financing activities	400,534	89,936
Net increase/ (decrease) in cash and cash equivalents	243,998	(9,525)
Cash and cash equivalents at beginning of year	120,541	106,557
Cash and cash equivalents at end of period	364,539	97,032
Supplementary schedule of non-cash investing and financing activities:
Cash paid for interest	23,742	15,591
Cash paid for income taxes, (net of refunds received)	9,827	16,600
Change in unrealized gain/ (loss) on available-for-sale securities, net of tax	(14,848)	6,322
Change in unrealized gain/ (loss) on cash flow hedges, net of tax	511	176
Change in unrealized gain/ (loss) on other, net of tax	1	12
Loans transferred into other real estate owned from loan portfolio	108	0
Loans charged-off	$ (529)	$ (521)