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Investment Securities (Available-for-sale And Held-to-maturity Securities, Continuous Unrealized Loss Position) (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
security
Available-for-sale, continuous unrealized loss position [Abstract]    
Number of securities | security 247 210
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]    
Less than 12 months, Fair Value $ 540,534 $ 631,042
12 months or longer, Fair Value 392,597 233,559
Total, Fair Value 933,131 864,601
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]    
Less than 12 months, Unrealized losses (14,063) (4,805)
12 months or longer, Unrealized losses (16,997) (4,654)
Total, Unrealized losses $ (31,060) $ (9,459)
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 $ 7,388 $ 6,600
Total, Fair Value 7,388 6,600
Held-to-maturity, continuous unrealized loss position, Unrealized losses [Abstract]    
12 months or longer, Unrealized losses (1,767) (2,516)
Total, Unrealized losses $ (1,767) $ (2,516)
U.S. Government Agency Securities [Member]    
Available-for-sale, continuous unrealized loss position [Abstract]    
Number of securities | security 12 9
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]    
Less than 12 months, Fair Value $ 40,756 $ 44,808
12 months or longer, Fair Value 13,112  
Total, Fair Value 53,868 44,808
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]    
Less than 12 months, Unrealized losses (1,271) (226)
12 months or longer, Unrealized losses (573)  
Total, Unrealized losses $ (1,844) $ (226)
Asset-backed Securities [Member]    
Available-for-sale, continuous unrealized loss position [Abstract]    
Number of securities | security 8 8
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]    
Less than 12 months, Fair Value $ 16,476 $ 11,264
12 months or longer, Fair Value 24,305 37,894
Total, Fair Value 40,781 49,158
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]    
Less than 12 months, Unrealized losses (8) (6)
12 months or longer, Unrealized losses (164) (269)
Total, Unrealized losses $ (172) $ (275)
Tax-exempt Obligations Of States And Political Subdivisions [Member]    
Available-for-sale, continuous unrealized loss position [Abstract]    
Number of securities | security 5 5
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]    
Less than 12 months, Fair Value $ 1,391 $ 3,982
12 months or longer, Fair Value 3,597 1,143
Total, Fair Value 4,988 5,125
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]    
Less than 12 months, Unrealized losses (6) (19)
12 months or longer, Unrealized losses (72) (17)
Total, Unrealized losses $ (78) $ (36)
Taxable obligations of states and political subdivisions [Member]    
Available-for-sale, continuous unrealized loss position [Abstract]    
Number of securities | security 28 15
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]    
Less than 12 months, Fair Value $ 31,462 $ 22,231
12 months or longer, Fair Value 12,671 2,853
Total, Fair Value 44,133 25,084
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]    
Less than 12 months, Unrealized losses (930) (181)
12 months or longer, Unrealized losses (612) (74)
Total, Unrealized losses $ (1,542) $ (255)
Residential Mortgage-backed Securities [Member]    
Available-for-sale, continuous unrealized loss position [Abstract]    
Number of securities | security 121 116
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]    
Less than 12 months, Fair Value $ 115,119 $ 249,572
12 months or longer, Fair Value 218,233 125,096
Total, Fair Value 333,352 374,668
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]    
Less than 12 months, Unrealized losses (2,189) (1,771)
12 months or longer, Unrealized losses (10,631) (2,827)
Total, Unrealized losses $ (12,820) $ (4,598)
Collateralized Mortgage Obligation Securities [Member]    
Available-for-sale, continuous unrealized loss position [Abstract]    
Number of securities | security 47 41
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]    
Less than 12 months, Fair Value $ 144,686 $ 148,655
12 months or longer, Fair Value 89,045 63,274
Total, Fair Value 233,731 211,929
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]    
Less than 12 months, Unrealized losses (4,199) (921)
12 months or longer, Unrealized losses (3,942) (1,397)
Total, Unrealized losses $ (8,141) $ (2,318)
Commercial Mortgage-backed Securities [Member]    
Available-for-sale, continuous unrealized loss position [Abstract]    
Number of securities | security 26 16
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]    
Less than 12 months, Fair Value $ 190,644 $ 150,530
12 months or longer, Fair Value 31,634 3,299
Total, Fair Value 222,278 153,829
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]    
Less than 12 months, Unrealized losses (5,460) (1,681)
12 months or longer, Unrealized losses (1,003) (70)
Total, Unrealized losses $ (6,463) $ (1,751)
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 $ 7,388 $ 6,600
Total, Fair Value 7,388 6,600
Held-to-maturity, continuous unrealized loss position, Unrealized losses [Abstract]    
12 months or longer, Unrealized losses (1,767) (2,516)
Total, Unrealized losses $ (1,767) $ (2,516)