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Condensed Parent Company Financial Statements - Schedule of Condensed Cash Flow Statement (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
OPERATING ACTIVITIES                      
Net income $ 15,897 $ 26,356 $ 26,341 $ 25,886 $ 24,218 $ 17,435 $ 22,109 $ 22,874 $ 94,482 $ 86,635 $ 80,762
Adjustments to reconcile net income to net cash provided by operating activities:                      
Equity in undistributed net income                   (900) (600)
Decrease in other assets                 4,593 13,137 (4,293)
Other-net                 (438) (574) 248
Net cash provided by operating activities                 141,626 123,077 88,386
INVESTING ACTIVITIES                      
Proceed from sales - securities available-for-sale                 7,760 277,225 635,609
Purchase of securities - securities available-for-sale                 (252,314) (213,894) (526,502)
Acquisitions and additional capitalization of subsidiaries, net of cash (paid) acquired                   4,863 (28,551)
Net cash (used in) provided by investing activities                 (77,375) 194,588 (210,328)
FINANCING ACTIVITIES                      
Repayment of junior subordinated debt                     (36,083)
Issuance of common stock                 1,040 1,713  
Repurchase of common stock warrant                     (2,247)
Treasury shares (purchased) sold-net                   (3,026) (2,542)
Net cash (used in) provided by financing activities                 (74,849) (276,180) 114,625
Net increase (decrease) in cash and cash equivalents                 (10,598) 41,485 (7,317)
Cash and cash equivalents at beginning of the year       128,170       86,685 128,170 86,685 94,002
Cash and cash equivalents at end of the year 117,572       128,170       117,572 128,170 86,685
Parent Company [Member]                      
OPERATING ACTIVITIES                      
Net income                 94,482 86,635 80,762
Adjustments to reconcile net income to net cash provided by operating activities:                      
Equity in undistributed net income                 (24,996) (7,228) (25,974)
Decrease in other assets                 566 14,679 199
Other-net                 2,848 2,094 1,657
Net cash provided by operating activities                 72,900 96,180 56,644
INVESTING ACTIVITIES                      
Proceed from sales - securities available-for-sale                     210
Purchase of securities - securities available-for-sale                 (200)    
Acquisitions and additional capitalization of subsidiaries, net of cash (paid) acquired                   (43,199) 1,465
Net cash (used in) provided by investing activities                 (200) (43,199) 1,675
FINANCING ACTIVITIES                      
Repayment of junior subordinated debt                     (36,083)
Repayment of other borrowings                     (13,000)
Issuance of common stock                 1,040 1,713  
Repurchase of common stock warrant                     (2,247)
Treasury shares (purchased) sold-net                   (3,026) (2,542)
Dividends paid to common and preferred shareholders                 (44,864) (37,805) (33,007)
Net cash (used in) provided by financing activities                 (43,824) (39,118) (86,879)
Net increase (decrease) in cash and cash equivalents                 28,876 13,863 (28,560)
Cash and cash equivalents at beginning of the year       $ 47,035       $ 33,172 47,035 33,172 61,732
Cash and cash equivalents at end of the year $ 75,911       $ 47,035       $ 75,911 $ 47,035 $ 33,172