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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net cash provided by (used in) operating activities $ 52,326 $ 71,998
Cash flows from investing activities:    
Proceeds from sale of property and equipment 12 8
Purchases of property and equipment (1,314) (1,255)
Purchases of equity securities (9,857) (243)
Purchases of available-for-sale debt securities (121,996) (26,610)
Purchases of investment real estate, net (1,034) (1,714)
Proceeds from sales of equity securities 1,045 2,500
Proceeds from sales of available-for-sale debt securities 99,464 914
Maturities of available-for-sale debt securities 25,363 18,915
Net cash provided by (used in) investing activities (8,317) (7,485)
Cash flows from financing activities:    
Preferred stock dividend (3) (3)
Common stock dividend (4,912) (4,924)
Purchase of treasury stock (2,746) (2,548)
Payments related to tax withholding for share-based compensation (4,793) (1,337)
Repayment of debt (368) (1,067)
Net cash provided by (used in) financing activities (12,822) (9,879)
Cash and cash equivalents, and restricted cash and cash equivalents:    
Net increase (decrease) during the period 31,187 54,634
Balance, beginning of period 216,121 108,365
Balance, end of period $ 247,308 $ 162,999