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Investment Securities - Unrealized Loss Positions (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months $ 9,063 $ 3,078
Greater than or equal to 12 continuous months 25,665 127,053
Total Securities in a loss position 34,728 130,131
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (24) (12)
Greater than or equal to 12 continuous months (201) (3,510)
Held-to-maturity, Gross Unrealized Losses (225) (3,522)
Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 15,019 81,533
Available-for-sale, greater than 12 continuous months, Fair value 21,735 234,850
Available-for-sale, Total Securities in a loss position, Fair Value 36,754 316,383
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (64) (657)
Available-for-sale, greater than 12 continuous months, Unrealized loss (138) (4,537)
Available-for-sale, Total Securities in a loss position, Unrealized loss (202) (5,194)
Marketable Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Marketable securities, less than 12 continuous months, Fair value 24,082 84,611
Marketable securities, greater than 12 continuous months, Fair value 47,400 361,903
Marketable securities, Total Securities in a loss position, Fair value 71,482 446,514
Marketable Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Marketable securities, less than 12 continuous months, Unrealized loss (88) (669)
Marketable securities, greater than 12 continuous months, Unrealized loss (339) (8,047)
Marketable securities, Total Securities in a loss position, Unrealized loss (427) (8,716)
MBS pass-through securities issued by FHLMC and FNMA    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months 9,063 198
Greater than or equal to 12 continuous months 23,799 83,990
Total Securities in a loss position 32,862 84,188
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (24) (9)
Greater than or equal to 12 continuous months (191) (2,800)
Held-to-maturity, Gross Unrealized Losses (215) (2,809)
Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 269 19,971
Available-for-sale, greater than 12 continuous months, Fair value 7,628 50,077
Available-for-sale, Total Securities in a loss position, Fair Value 7,897 70,048
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (1) (128)
Available-for-sale, greater than 12 continuous months, Unrealized loss (46) (1,102)
Available-for-sale, Total Securities in a loss position, Unrealized loss (47) (1,230)
SBA-backed securities    
Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 0 13,175
Available-for-sale, greater than 12 continuous months, Fair value 2,785 20,123
Available-for-sale, Total Securities in a loss position, Fair Value 2,785 33,298
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss 0 (122)
Available-for-sale, greater than 12 continuous months, Unrealized loss (61) (284)
Available-for-sale, Total Securities in a loss position, Unrealized loss (61) (406)
CMOs issued by FNMA    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months   0
Greater than or equal to 12 continuous months   11,327
Total Securities in a loss position   11,327
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months   0
Greater than or equal to 12 continuous months   (120)
Held-to-maturity, Gross Unrealized Losses   (120)
Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 0 2,345
Available-for-sale, greater than 12 continuous months, Fair value 0 16,138
Available-for-sale, Total Securities in a loss position, Fair Value 0 18,483
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss 0 (8)
Available-for-sale, greater than 12 continuous months, Unrealized loss 0 (322)
Available-for-sale, Total Securities in a loss position, Unrealized loss 0 (330)
CMOs issued by FHLMC    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months 0 2,880
Greater than or equal to 12 continuous months 1,866 28,171
Total Securities in a loss position 1,866 31,051
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months 0 (3)
Greater than or equal to 12 continuous months (10) (567)
Held-to-maturity, Gross Unrealized Losses (10) (570)
Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 7,735 24,094
Available-for-sale, greater than 12 continuous months, Fair value 9,722 74,243
Available-for-sale, Total Securities in a loss position, Fair Value 17,457 98,337
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (13) (330)
Available-for-sale, greater than 12 continuous months, Unrealized loss (25) (1,267)
Available-for-sale, Total Securities in a loss position, Unrealized loss (38) (1,597)
CMOs issued by GNMA    
Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 0 1,666
Available-for-sale, greater than 12 continuous months, Fair value 130 9,112
Available-for-sale, Total Securities in a loss position, Fair Value 130 10,778
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss 0 (7)
Available-for-sale, greater than 12 continuous months, Unrealized loss (1) (267)
Available-for-sale, Total Securities in a loss position, Unrealized loss (1) (274)
Debentures of government- sponsored agencies    
Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value   4,992
Available-for-sale, greater than 12 continuous months, Fair value   11,349
Available-for-sale, Total Securities in a loss position, Fair Value   16,341
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss   (8)
Available-for-sale, greater than 12 continuous months, Unrealized loss   (115)
Available-for-sale, Total Securities in a loss position, Unrealized loss   (123)
Privately issued CMOs    
Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 79  
Available-for-sale, greater than 12 continuous months, Fair value 0  
Available-for-sale, Total Securities in a loss position, Fair Value 79  
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (1)  
Available-for-sale, greater than 12 continuous months, Unrealized loss 0  
Available-for-sale, Total Securities in a loss position, Unrealized loss (1)  
Obligations of state and political subdivisions    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months   0
Greater than or equal to 12 continuous months   3,565
Total Securities in a loss position   3,565
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months   0
Greater than or equal to 12 continuous months   (23)
Held-to-maturity, Gross Unrealized Losses   (23)
Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 6,936 15,290
Available-for-sale, greater than 12 continuous months, Fair value 966 52,804
Available-for-sale, Total Securities in a loss position, Fair Value 7,902 68,094
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (49) (54)
Available-for-sale, greater than 12 continuous months, Unrealized loss (4) (1,166)
Available-for-sale, Total Securities in a loss position, Unrealized loss (53) (1,220)
Corporate bonds    
Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 0 0
Available-for-sale, greater than 12 continuous months, Fair value 504 1,004
Available-for-sale, Total Securities in a loss position, Fair Value 504 1,004
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss 0 0
Available-for-sale, greater than 12 continuous months, Unrealized loss (1) (14)
Available-for-sale, Total Securities in a loss position, Unrealized loss $ (1) $ (14)