Parent Company Financial Information (Condensed Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Assets
Cash and due from banks	$ 166,929	$ 171,221
Interest-earning deposits	8,373	16,949
Total cash and cash equivalents	175,302	188,170	$ 179,561	$ 513,926
Other assets	235,854	231,877
Total Assets	8,951,697	8,578,846
Liabilities and Shareholders’ Equity
Other borrowings	0	8,248
Other liabilities	102,510	96,053
Total liabilities	7,709,569	7,350,671
Shareholders’ equity	1,242,128	1,228,175	1,053,249	764,008
Total liabilities and shareholders' equity	8,951,697	8,578,846
Parent Company [Member]
Assets
Cash and due from banks	3,429	10,322
Interest-earning deposits	560	12,274
Total cash and cash equivalents	3,989	22,596	$ 53,684	$ 86,644
Other assets	4,833	5,273
Total Assets	1,242,459	1,240,363
Liabilities and Shareholders’ Equity
Other borrowings	0	8,248
Other liabilities	331	3,940
Total liabilities	331	12,188
Shareholders’ equity	1,242,128	1,228,175
Total liabilities and shareholders' equity	1,242,459	1,240,363
Banking Subsidiaries [Member] | Parent Company [Member]
Assets
Investment in subsidiaries	1,228,070	1,207,143
Other Subsidiaries [Member] | Parent Company [Member]
Assets
Investment in subsidiaries	$ 5,567	$ 5,351