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Investment Securities (Available-for-sale And Held-to-maturity Securities, Continuous Unrealized Loss Position) (Details)
$ in Thousands
Sep. 30, 2021
USD ($)
security
Dec. 31, 2020
USD ($)
security
Available-for-sale, continuous unrealized loss position [Abstract]    
Number of securities | security 56 53
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]    
Less than 12 months, Fair Value $ 206,215 $ 202,253
12 months or longer, Fair Value 80,861 76,820
Total, Fair Value 287,076 279,073
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]    
Less than 12 months, Unrealized losses (844) (4,946)
12 months or longer, Unrealized losses (4,198) (3,550)
Total, Unrealized losses $ (5,042) $ (8,496)
U.S. Government Agency Securities [Member]    
Available-for-sale, continuous unrealized loss position [Abstract]    
Number of securities | security 2 5
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]    
Less than 12 months, Fair Value   $ 594
12 months or longer, Fair Value $ 2,817 5,322
Total, Fair Value 2,817 5,916
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]    
Less than 12 months, Unrealized losses   (2)
12 months or longer, Unrealized losses (49) (118)
Total, Unrealized losses $ (49) $ (120)
Asset-backed Securities [Member]    
Available-for-sale, continuous unrealized loss position [Abstract]    
Number of securities | security 27 24
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]    
Less than 12 months, Fair Value $ 148,324 $ 123,447
12 months or longer, Fair Value 1,233 29,563
Total, Fair Value 149,557 153,010
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]    
Less than 12 months, Unrealized losses (68) (337)
12 months or longer, Unrealized losses (2) (123)
Total, Unrealized losses $ (70) $ (460)
Residential Mortgage-backed Securities [Member]    
Available-for-sale, continuous unrealized loss position [Abstract]    
Number of securities | security 14 12
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]    
Less than 12 months, Fair Value $ 13,688 $ 6,221
12 months or longer, Fair Value 3,743 6,650
Total, Fair Value 17,431 12,871
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]    
Less than 12 months, Unrealized losses (118) (35)
12 months or longer, Unrealized losses (91) (61)
Total, Unrealized losses $ (209) $ (96)
Collateralized Mortgage Obligation Securities [Member]    
Available-for-sale, continuous unrealized loss position [Abstract]    
Number of securities | security 1 6
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]    
Less than 12 months, Fair Value   $ 2,505
12 months or longer, Fair Value $ 424 3,489
Total, Fair Value 424 5,994
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]    
Less than 12 months, Unrealized losses   (10)
12 months or longer, Unrealized losses (1) (1)
Total, Unrealized losses $ (1) $ (11)
Commercial Mortgage-backed Securities [Member]    
Available-for-sale, continuous unrealized loss position [Abstract]    
Number of securities | security 11 4
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]    
Less than 12 months, Fair Value $ 44,203 $ 69,486
12 months or longer, Fair Value 66,139  
Total, Fair Value 110,342 69,486
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]    
Less than 12 months, Unrealized losses (658) (4,562)
12 months or longer, Unrealized losses (560)  
Total, Unrealized losses $ (1,218) $ (4,562)
Corporate Debt Securities [Member]    
Available-for-sale, continuous unrealized loss position [Abstract]    
Number of securities | security 1 2
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]    
12 months or longer, Fair Value $ 6,505 $ 31,796
Total, Fair Value 6,505 31,796
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]    
12 months or longer, Unrealized losses (3,495) (3,247)
Total, Unrealized losses $ (3,495) $ (3,247)