Consolidated Statements of Income (Unaudited) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Interest on other borrowings	$ 4,802	$ 3,658
Securities gains, net	4,353	781
Income taxes	7,599	1,703
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Derivatives [Member]
Interest on other borrowings	564	521
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]
Securities gains, net	4,353	781
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Income taxes	$ 1,413	$ 97