Parent Company Financial Information (Condensed Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assets
Cash and due from banks	$ 193,038	$ 166,929
Interest-earning deposits	31,200	8,373
Total cash and cash equivalents	224,238	175,302	$ 188,170	$ 179,561
Other assets	256,984	235,854
Total Assets	9,509,607	8,951,697
Liabilities and Shareholders’ Equity
Other borrowings			8,200
Other liabilities	111,865	102,510
Total liabilities	8,258,595	7,709,569
Shareholders’ equity	1,251,012	1,242,128	1,228,175	1,053,249
Total liabilities and shareholders' equity	9,509,607	8,951,697
Parent Company [Member]
Assets
Cash and due from banks	1,718	3,429
Interest-earning deposits	729	560
Total cash and cash equivalents	2,447	3,989	$ 22,596	$ 53,684
Other assets	5,146	4,833
Total Assets	1,251,283	1,242,459
Liabilities and Shareholders’ Equity
Other liabilities	271	331
Total liabilities	271	331
Shareholders’ equity	1,251,012	1,242,128
Total liabilities and shareholders' equity	1,251,283	1,242,459
Banking Subsidiaries [Member] | Parent Company [Member]
Assets
Investment in subsidiaries	1,238,712	1,228,070
Other Subsidiaries [Member] | Parent Company [Member]
Assets
Investment in subsidiaries	$ 4,978	$ 5,567