Investment Securities (Available-for-sale And Held-to-maturity Securities, Continuous Unrealized Loss Position) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013 security	Dec. 31, 2012 security
Available-for-sale, continuous unrealized loss position [Abstract]
Number of securities	459	38
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months, Fair Value	$ 592,970	$ 155,341
12 months or longer, Fair Value	67,734	13,152
Total, Fair Value	660,704	168,493
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]
Less than 12 months, Unrealized losses	(6,443)	(922)
12 months or longer, Unrealized losses	(866)	(299)
Total, Unrealized losses	(7,309)	(1,221)
Held-to-maturity, continuous unrealized loss position [Abstract]
Number of securities	2	3
Held-to-maturity, continuous unrealized loss position, Fair Value [Abstract]
12 months or longer, Fair Value	7,887	8,443
Total, Fair Value	7,887	8,443
Held-to-maturity, continuous unrealized loss position, Unrealized losses [Abstract]
12 months or longer, Unrealized losses	(4,222)	(4,425)
Total, Unrealized losses	(4,222)	(4,425)
U.S. Government Agency Securities [Member]
Available-for-sale, continuous unrealized loss position [Abstract]
Number of securities	4
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months, Fair Value	3,300
Total, Fair Value	3,300
Federally Insured Student Loan Securities [Member]
Available-for-sale, continuous unrealized loss position [Abstract]
Number of securities	9	5
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months, Fair Value	50,498	33,615
12 months or longer, Fair Value	6,202
Total, Fair Value	56,700	33,615
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]
Less than 12 months, Unrealized losses	(676)	(83)
12 months or longer, Unrealized losses	(44)
Total, Unrealized losses	(720)	(83)
Tax-exempt Obligations Of States And Political Subdivisions [Member]
Available-for-sale, continuous unrealized loss position [Abstract]
Number of securities	229	4
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months, Fair Value	169,995	4,511
Total, Fair Value	169,995	4,511
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]
Less than 12 months, Unrealized losses	(1,951)	(2)
Total, Unrealized losses	(1,951)	(2)
Taxable Obligations Of States And Political Subdivisions [Member]
Available-for-sale, continuous unrealized loss position [Abstract]
Number of securities	52	6
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months, Fair Value	46,888	2,357
12 months or longer, Fair Value	1,808	4,529
Total, Fair Value	48,696	6,886
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]
Less than 12 months, Unrealized losses	(737)	(11)
12 months or longer, Unrealized losses	(9)	(10)
Total, Unrealized losses	(746)	(21)
Residential Mortgage-backed Securities [Member]
Available-for-sale, continuous unrealized loss position [Abstract]
Number of securities	38	17
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months, Fair Value	147,717	107,926
12 months or longer, Fair Value	55,064
Total, Fair Value	202,781	107,926
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]
Less than 12 months, Unrealized losses	(1,656)	(779)
12 months or longer, Unrealized losses	(606)
Total, Unrealized losses	(2,262)	(779)
Commercial Mortgage-backed Securities [Member]
Available-for-sale, continuous unrealized loss position [Abstract]
Number of securities	26	2
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months, Fair Value	76,668	5,447
12 months or longer, Fair Value	405
Total, Fair Value	77,073	5,447
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]
Less than 12 months, Unrealized losses	(399)	(32)
12 months or longer, Unrealized losses	(11)
Total, Unrealized losses	(410)	(32)
Corporate And Other Debt Securities [Member]
Available-for-sale, continuous unrealized loss position [Abstract]
Number of securities	101	4
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months, Fair Value	97,904	1,485
12 months or longer, Fair Value	4,255	8,623
Total, Fair Value	102,159	10,108
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]
Less than 12 months, Unrealized losses	(1,024)	(15)
12 months or longer, Unrealized losses	(196)	(289)
Total, Unrealized losses	(1,220)	(304)
Single Issuers [Member]
Held-to-maturity, continuous unrealized loss position [Abstract]
Number of securities	2	2
Held-to-maturity, continuous unrealized loss position, Fair Value [Abstract]
12 months or longer, Fair Value	7,887	7,850
Total, Fair Value	7,887	7,850
Held-to-maturity, continuous unrealized loss position, Unrealized losses [Abstract]
12 months or longer, Unrealized losses	(4,222)	(4,241)
Total, Unrealized losses	(4,222)	(4,241)
Pooled [Member]
Held-to-maturity, continuous unrealized loss position [Abstract]
Number of securities	0	1
Held-to-maturity, continuous unrealized loss position, Fair Value [Abstract]
12 months or longer, Fair Value		593
Total, Fair Value		593
Held-to-maturity, continuous unrealized loss position, Unrealized losses [Abstract]
12 months or longer, Unrealized losses		(184)
Total, Unrealized losses		$ (184)