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Investment Securities (Available-for-sale And Held-to-maturity Securities, Continuous Unrealized Loss Position) (Details)
$ in Thousands
Sep. 30, 2017
USD ($)
security
Dec. 31, 2016
USD ($)
security
Available-for-sale, continuous unrealized loss position [Abstract]    
Number of securities | security 204 260
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]    
Less than 12 months, Fair Value $ 334,943 $ 472,371
12 months or longer, Fair Value 196,981 195,032
Total, Fair Value 531,924 667,403
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]    
Less than 12 months, Unrealized losses (2,424) (8,324)
12 months or longer, Unrealized losses (2,816) (2,869)
Total, Unrealized losses $ (5,240) $ (11,193)
Held-to-maturity, continuous unrealized loss position [Abstract]    
Number of securities | security 1 1
Held-to-maturity, continuous unrealized loss position, Fair Value [Abstract]    
12 months or longer, Fair Value $ 6,343 $ 6,039
Total, Fair Value 6,343 6,039
Held-to-maturity, continuous unrealized loss position, Unrealized losses [Abstract]    
12 months or longer, Unrealized losses (2,761) (3,026)
Total, Unrealized losses $ (2,761) $ (3,026)
U.S. Government Agency Securities [Member]    
Available-for-sale, continuous unrealized loss position [Abstract]    
Number of securities | security 4 5
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]    
Less than 12 months, Fair Value $ 17,266 $ 7,414
12 months or longer, Fair Value   7,824
Total, Fair Value 17,266 15,238
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]    
Less than 12 months, Unrealized losses (24) (36)
12 months or longer, Unrealized losses   (56)
Total, Unrealized losses $ (24) $ (92)
Asset-backed Securities [Member]    
Available-for-sale, continuous unrealized loss position [Abstract]    
Number of securities | security 16 23
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]    
Less than 12 months, Fair Value $ 16,453 $ 10,186
12 months or longer, Fair Value 58,961 93,375
Total, Fair Value 75,414 103,561
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]    
Less than 12 months, Unrealized losses (20) (49)
12 months or longer, Unrealized losses (419) (1,988)
Total, Unrealized losses $ (439) $ (2,037)
Tax-exempt Obligations Of States And Political Subdivisions [Member]    
Available-for-sale, continuous unrealized loss position [Abstract]    
Number of securities | security 2 8
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]    
Less than 12 months, Fair Value   $ 6,056
12 months or longer, Fair Value $ 2,148 3,301
Total, Fair Value 2,148 9,357
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]    
Less than 12 months, Unrealized losses   (118)
12 months or longer, Unrealized losses (17) (19)
Total, Unrealized losses $ (17) $ (137)
Taxable Obligations Of States And Political Subdivisions [Member]    
Available-for-sale, continuous unrealized loss position [Abstract]    
Number of securities | security 14 27
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]    
Less than 12 months, Fair Value $ 14,844 $ 42,963
12 months or longer, Fair Value 977  
Total, Fair Value 15,821 42,963
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]    
Less than 12 months, Unrealized losses (127) (633)
12 months or longer, Unrealized losses (23)  
Total, Unrealized losses $ (150) $ (633)
Residential Mortgage-backed Securities [Member]    
Available-for-sale, continuous unrealized loss position [Abstract]    
Number of securities | security 93 68
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]    
Less than 12 months, Fair Value $ 173,175 $ 180,357
12 months or longer, Fair Value 98,021 54,254
Total, Fair Value 271,196 234,611
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]    
Less than 12 months, Unrealized losses (1,573) (4,833)
12 months or longer, Unrealized losses (1,847) (316)
Total, Unrealized losses $ (3,420) $ (5,149)
Collateralized Mortgage Obligations [Member]    
Available-for-sale, continuous unrealized loss position [Abstract]    
Number of securities | security 26 28
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]    
Less than 12 months, Fair Value $ 62,244 $ 88,936
12 months or longer, Fair Value 30,937 30,386
Total, Fair Value 93,181 119,322
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]    
Less than 12 months, Unrealized losses (468) (1,004)
12 months or longer, Unrealized losses (455) (441)
Total, Unrealized losses $ (923) $ (1,445)
Commercial Mortgage-backed Securities [Member]    
Available-for-sale, continuous unrealized loss position [Abstract]    
Number of securities | security 8 28
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]    
Less than 12 months, Fair Value $ 23,434 $ 79,345
12 months or longer, Fair Value 243 4,547
Total, Fair Value 23,677 83,892
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]    
Less than 12 months, Unrealized losses (114) (963)
12 months or longer, Unrealized losses   (45)
Total, Unrealized losses $ (114) $ (1,008)
Foreign Debt Securities [Member]    
Available-for-sale, continuous unrealized loss position [Abstract]    
Number of securities | security 21 34
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]    
Less than 12 months, Fair Value $ 15,869 $ 26,696
12 months or longer, Fair Value 1,180 700
Total, Fair Value 17,049 27,396
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]    
Less than 12 months, Unrealized losses (68) (274)
12 months or longer, Unrealized losses (20)  
Total, Unrealized losses $ (88) $ (274)
Corporate Debt Securities [Member]    
Available-for-sale, continuous unrealized loss position [Abstract]    
Number of securities | security 20 39
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]    
Less than 12 months, Fair Value $ 11,658 $ 30,418
12 months or longer, Fair Value 4,514 645
Total, Fair Value 16,172 31,063
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]    
Less than 12 months, Unrealized losses (30) (414)
12 months or longer, Unrealized losses (35) (4)
Total, Unrealized losses $ (65) $ (418)
Single Issuers [Member]    
Held-to-maturity, continuous unrealized loss position [Abstract]    
Number of securities | security 1 1
Held-to-maturity, continuous unrealized loss position, Fair Value [Abstract]    
12 months or longer, Fair Value $ 6,343 $ 6,039
Total, Fair Value 6,343 6,039
Held-to-maturity, continuous unrealized loss position, Unrealized losses [Abstract]    
12 months or longer, Unrealized losses (2,761) (3,026)
Total, Unrealized losses $ (2,761) $ (3,026)