Parent Company Only Financial Information (Tables)

12 Months Ended

Dec. 31, 2016

Condensed Financial Information Of Parent Company Only Disclosure [Abstract]

Parent Only Financial Statements

Condensed Balance Sheets	December 31,
	2016		2015
Assets:
Investment in banks	$	1,566,186	$	1,518,292
Other assets		16,756		17,339
Total Assets	$	1,582,942	$	1,535,631
Liabilities and Shareholders' Equity:
Accrued expense	$	878	$	718
Junior subordinated debt securities		61,856		61,856
Shareholders' equity		1,520,208		1,473,057
Total Liabilities and Shareholders' Equity	$	1,582,942	$	1,535,631

Condensed Statements of Income	Years Ended December 31,
	2016		2015		2014
Revenue:
Dividends received from banks	$	65,987	$	64,752	$	64,351
Earnings of subsidiaries over distributions		44,756		53,562		60,783
Other income		60		55		55
Total Revenue		110,803		118,369		125,189
Expense:
Other expense		2,392		2,331		1,627
Total Expense		2,392		2,331		1,627
Net Income	$	108,411	$	116,038	$	123,562

Condensed Statements of Cash Flows	Years Ended December 31,
	2016			2015			2014
Operating Activities:
Net income	$	108,411		$	116,038		$	123,562
Adjustments to reconcile net income to net cash provided    by operating activities:
Increase in investment in subsidiaries		(44,756	)		(53,562	)		(60,783	)
Other		(739	)		(761	)		(2,158	)
Net cash provided by operating activities		62,916			61,715			60,621
Financing Activities:
Cash dividends paid on common stock		(62,666	)		(62,605	)		(62,474	)
Other common stock transactions, net		(857	)		(211	)		(1,502	)
Net cash used in financing activities		(63,523	)		(62,816	)		(63,976	)
Decrease in cash and cash equivalents		(607	)		(1,101	)		(3,355	)
Cash and cash equivalents at beginning of year		17,320			18,421			21,776
Cash and cash equivalents at end of year	$	16,713		$	17,320		$	18,421