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Parent Company Only Condensed Financial Statements - Consolidated Statements of Cash Flow (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Adjustments to reconcile net income to net cash provided by operating activities      
Share-based compensation $ 3,367 $ 3,601 $ 2,950
Excess tax benefit of share-based compensation (1,327) (449) (205)
Net cash provided by operating activities 82,521 47,187 31,494
Cash flows from investing activities:      
Net cash used in investing activities (358,057) (337,250) (212,826)
Cash flows from financing activities:      
Repayments of notes payable 0 (5,700) (4,800)
Cash dividends paid (8,211) (5,259) (4,177)
Excess tax benefit of share-based compensation 1,327 449 205
Issuance of common stock 2 2 2
Common stock repurchased (4,889) 0 0
Proceeds from the issuance of equity instruments, net (2,205) (1,192) (681)
Net cash provided by financing activities 380,181 283,524 71,459
Net increase (decrease) in cash and cash equivalents 104,645 (6,539) (109,873)
Cash and cash equivalents, beginning of period 94,157 100,696 210,569
Cash and cash equivalents, end of period 198,802 94,157 100,696
Parent [Member]      
Cash flows from operating activities:      
Net income available to common shareholders 48,837 38,450 27,173
Adjustments to reconcile net income to net cash provided by operating activities      
Share-based compensation 3,367 3,601 2,950
Net income of subsidiaries (53,235) (41,298) (30,560)
Dividends from subsidiaries 7,500 10,000 10,000
Excess tax benefit of share-based compensation (1,327) (449) (205)
Other, net 1,848 848 704
Net cash provided by operating activities 6,990 11,152 10,062
Cash flows from investing activities:      
Cash contributions to subsidiaries (250) 0 0
Purchases of other investments (2,435) (2,832) (2,224)
Proceeds from distributions on other investments 1,151 880 176
Net cash used in investing activities (1,534) (1,952) (2,048)
Cash flows from financing activities:      
Proceeds from notes payable 48,733 0 0
Repayments of notes payable 0 (5,700) (4,800)
Cash dividends paid (8,211) (5,259) (4,177)
Excess tax benefit of share-based compensation 1,327 449 205
Payments for the repurchase of preferred stock (4,889) 0 0
Issuance of common stock 2 2 2
Proceeds from the issuance of equity instruments, net (2,205) (1,192) (681)
Net cash provided by financing activities 34,757 (11,700) (9,451)
Net increase (decrease) in cash and cash equivalents 40,213 (2,500) (1,437)
Cash and cash equivalents, beginning of period 12,032 14,532 15,969
Cash and cash equivalents, end of period $ 52,245 $ 12,032 $ 14,532