Securities (Securities in a Continuous Unrealized Loss Position) (Details) $ in Thousands	Sep. 30, 2016 USD ($) security	Dec. 31, 2015 USD ($) security
Schedule of Available-for-sale Securities [Line Items]
Number of securities in a continuous unrealized loss position for less than 12 months | security	10	16
Fair value of securities in a continuous unrealized loss position for less than 12 months	$ 166,333	$ 97,766
Unrealized losses of securities in a continuous unrealized loss position for less than 12 months	$ (372)	$ (858)
Number of securities in a continuous unrealized loss position for 12 months or longer | security	10	10
Fair value of securities in a continuous unrealized loss position for 12 months or longer	$ 25,684	$ 25,138
Unrealized losses of securities in a continuous unrealized loss position for 12 months or longer	$ (4,158)	$ (4,677)
Number of securities in a continuous unrealized loss position total | security	20	26
Fair value of securities in a continuous unrealized loss position total	$ 192,017	$ 122,904
Unrealized losses of securities in a continuous unrealized loss position total	$ (4,530)	$ (5,535)
Obligations of U.S. government-sponsored enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of securities in a continuous unrealized loss position for less than 12 months | security	2	4
Fair value of securities in a continuous unrealized loss position for less than 12 months	$ 29,935	$ 34,767
Unrealized losses of securities in a continuous unrealized loss position for less than 12 months	$ (65)	$ (388)
Number of securities in a continuous unrealized loss position for 12 months or longer | security	0	0
Fair value of securities in a continuous unrealized loss position for 12 months or longer	$ 0	$ 0
Unrealized losses of securities in a continuous unrealized loss position for 12 months or longer	$ 0	$ 0
Number of securities in a continuous unrealized loss position total | security	2	4
Fair value of securities in a continuous unrealized loss position total	$ 29,935	$ 34,767
Unrealized losses of securities in a continuous unrealized loss position total	$ (65)	$ (388)
Mortgage-backed securities issued by U.S. government-sponsored agencies and U.S. government-sponsored enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of securities in a continuous unrealized loss position for less than 12 months | security	8	9
Fair value of securities in a continuous unrealized loss position for less than 12 months	$ 136,398	$ 61,764
Unrealized losses of securities in a continuous unrealized loss position for less than 12 months	$ (307)	$ (450)
Number of securities in a continuous unrealized loss position for 12 months or longer | security	0	0
Fair value of securities in a continuous unrealized loss position for 12 months or longer	$ 0	$ 0
Unrealized losses of securities in a continuous unrealized loss position for 12 months or longer	$ 0	$ 0
Number of securities in a continuous unrealized loss position total | security	8	9
Fair value of securities in a continuous unrealized loss position total	$ 136,398	$ 61,764
Unrealized losses of securities in a continuous unrealized loss position total	$ (307)	$ (450)
Individual name issuer trust preferred debt securities
Schedule of Available-for-sale Securities [Line Items]
Number of securities in a continuous unrealized loss position for less than 12 months | security	0	0
Fair value of securities in a continuous unrealized loss position for less than 12 months	$ 0	$ 0
Unrealized losses of securities in a continuous unrealized loss position for less than 12 months	$ 0	$ 0
Number of securities in a continuous unrealized loss position for 12 months or longer | security	10	10
Fair value of securities in a continuous unrealized loss position for 12 months or longer	$ 25,684	$ 25,138
Unrealized losses of securities in a continuous unrealized loss position for 12 months or longer	$ (4,158)	$ (4,677)
Number of securities in a continuous unrealized loss position total | security	10	10
Fair value of securities in a continuous unrealized loss position total	$ 25,684	$ 25,138
Unrealized losses of securities in a continuous unrealized loss position total	$ (4,158)	$ (4,677)
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of securities in a continuous unrealized loss position for less than 12 months | security		3
Fair value of securities in a continuous unrealized loss position for less than 12 months		$ 1,235
Unrealized losses of securities in a continuous unrealized loss position for less than 12 months		$ (20)
Number of securities in a continuous unrealized loss position for 12 months or longer | security		0
Fair value of securities in a continuous unrealized loss position for 12 months or longer		$ 0
Unrealized losses of securities in a continuous unrealized loss position for 12 months or longer		$ 0
Number of securities in a continuous unrealized loss position total | security		3
Fair value of securities in a continuous unrealized loss position total		$ 1,235
Unrealized losses of securities in a continuous unrealized loss position total		$ (20)