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Investment Securities - Other Than Temporarily Impaired Debt Securities (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
security
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Number of investment securities in unrealized loss positions | security 40 229
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]    
Held-to-maturity, Less than 12 continuous months, Fair value $ 14,203 $ 3,078
Held-to-maturity, Less than 12 continuous months, Unrealized loss (60) (12)
Held-to-maturity, Greater than 12 continuous months, Fair value 7,798 127,053
Held-to-maturity, Greater than 12 continuous months, Unrealized loss (89) (3,510)
Held-to-maturity, Total securities in a loss position, Fair value 22,001 130,131
Held-to-maturity, Total securities in a loss position, Unrealized loss (149) (3,522)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] (Deprecated 2019-01-31)    
Available-for-sale, Less than 12 continuous months, Fair value 81,958 81,533
Available-for-sale, Less than 12 continuous months, Unrealized loss (328) (657)
Available-for-sale, Greater than 12 continuous months, Fair value 10,552 234,850
Available-for-sale, Greater than 12 continuous months, Unrealized loss (83) (4,537)
Available-for-sale, Unrealized loss position, Fair value 92,510 316,383
Available-for-sale, Total securities in a loss position, Unrealized loss (411) (5,194)
Available-for-sale and Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] [Abstract]    
Total temporarily impaired securities, Less than 12 continuous months, Fair value 96,161 84,611
Total temporarily impaired securities, Less than 12 continuous months, Unrealized loss (388) (669)
Total temporarily impaired securities, Greater than 12 continuous months, Fair value 18,350 361,903
Total temporarily impaired securities, Greater than 12 continuous months, Unrealized loss (172) (8,047)
Total temporarily impaired securities, Total securities in a loss position, Fair value 114,511 446,514
Total temporarily impaired securities, Total securities in a loss position, Unrealized loss $ (560) (8,716)
Number of securities in continuous loss position for more than 12 months | security 16  
Number of securities in continuous loss position for less than 12 months | security 24  
MBS pass-through securities issued by FHLMC and FNMA    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]    
Held-to-maturity, Less than 12 continuous months, Fair value $ 14,203 198
Held-to-maturity, Less than 12 continuous months, Unrealized loss (60) (9)
Held-to-maturity, Greater than 12 continuous months, Fair value 6,073 83,990
Held-to-maturity, Greater than 12 continuous months, Unrealized loss (84) (2,800)
Held-to-maturity, Total securities in a loss position, Fair value 20,276 84,188
Held-to-maturity, Total securities in a loss position, Unrealized loss (144) (2,809)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] (Deprecated 2019-01-31)    
Available-for-sale, Less than 12 continuous months, Fair value 4,367 19,971
Available-for-sale, Less than 12 continuous months, Unrealized loss (34) (128)
Available-for-sale, Greater than 12 continuous months, Fair value 4,464 50,077
Available-for-sale, Greater than 12 continuous months, Unrealized loss (14) (1,102)
Available-for-sale, Unrealized loss position, Fair value 8,831 70,048
Available-for-sale, Total securities in a loss position, Unrealized loss (48) (1,230)
SBA-backed securities    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]    
Held-to-maturity, Total securities in a loss position, Unrealized loss 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] (Deprecated 2019-01-31)    
Available-for-sale, Less than 12 continuous months, Fair value 9,227 13,175
Available-for-sale, Less than 12 continuous months, Unrealized loss (14) (122)
Available-for-sale, Greater than 12 continuous months, Fair value 2,448 20,123
Available-for-sale, Greater than 12 continuous months, Unrealized loss (62) (284)
Available-for-sale, Unrealized loss position, Fair value 11,675 33,298
Available-for-sale, Total securities in a loss position, Unrealized loss (76) (406)
CMOs issued by FNMA    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]    
Held-to-maturity, Less than 12 continuous months, Fair value   0
Held-to-maturity, Less than 12 continuous months, Unrealized loss   0
Held-to-maturity, Greater than 12 continuous months, Fair value   11,327
Held-to-maturity, Greater than 12 continuous months, Unrealized loss   (120)
Held-to-maturity, Total securities in a loss position, Fair value   11,327
Held-to-maturity, Total securities in a loss position, Unrealized loss 0 (120)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] (Deprecated 2019-01-31)    
Available-for-sale, Less than 12 continuous months, Fair value   2,345
Available-for-sale, Less than 12 continuous months, Unrealized loss   (8)
Available-for-sale, Greater than 12 continuous months, Fair value   16,138
Available-for-sale, Greater than 12 continuous months, Unrealized loss   (322)
Available-for-sale, Unrealized loss position, Fair value   18,483
Available-for-sale, Total securities in a loss position, Unrealized loss   (330)
CMOs issued by FHLMC    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]    
Held-to-maturity, Less than 12 continuous months, Fair value 0 2,880
Held-to-maturity, Less than 12 continuous months, Unrealized loss 0 (3)
Held-to-maturity, Greater than 12 continuous months, Fair value 1,725 28,171
Held-to-maturity, Greater than 12 continuous months, Unrealized loss (5) (567)
Held-to-maturity, Total securities in a loss position, Fair value 1,725 31,051
Held-to-maturity, Total securities in a loss position, Unrealized loss (5) (570)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] (Deprecated 2019-01-31)    
Available-for-sale, Less than 12 continuous months, Fair value 14,918 24,094
Available-for-sale, Less than 12 continuous months, Unrealized loss (58) (330)
Available-for-sale, Greater than 12 continuous months, Fair value 2,981 74,243
Available-for-sale, Greater than 12 continuous months, Unrealized loss (6) (1,267)
Available-for-sale, Unrealized loss position, Fair value 17,899 98,337
Available-for-sale, Total securities in a loss position, Unrealized loss (64) (1,597)
CMOs issued by GNMA    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]    
Held-to-maturity, Total securities in a loss position, Unrealized loss 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] (Deprecated 2019-01-31)    
Available-for-sale, Less than 12 continuous months, Fair value 7,139 1,666
Available-for-sale, Less than 12 continuous months, Unrealized loss (6) (7)
Available-for-sale, Greater than 12 continuous months, Fair value 0 9,112
Available-for-sale, Greater than 12 continuous months, Unrealized loss 0 (267)
Available-for-sale, Unrealized loss position, Fair value 7,139 10,778
Available-for-sale, Total securities in a loss position, Unrealized loss (6) (274)
Debentures of government- sponsored agencies    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] (Deprecated 2019-01-31)    
Available-for-sale, Less than 12 continuous months, Fair value 25,228 4,992
Available-for-sale, Less than 12 continuous months, Unrealized loss (70) (8)
Available-for-sale, Greater than 12 continuous months, Fair value 0 11,349
Available-for-sale, Greater than 12 continuous months, Unrealized loss 0 (115)
Available-for-sale, Unrealized loss position, Fair value 25,228 16,341
Available-for-sale, Total securities in a loss position, Unrealized loss (70) (123)
Obligations of state and political subdivisions    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]    
Held-to-maturity, Less than 12 continuous months, Fair value   0
Held-to-maturity, Less than 12 continuous months, Unrealized loss   0
Held-to-maturity, Greater than 12 continuous months, Fair value   3,565
Held-to-maturity, Greater than 12 continuous months, Unrealized loss   (23)
Held-to-maturity, Total securities in a loss position, Fair value   3,565
Held-to-maturity, Total securities in a loss position, Unrealized loss 0 (23)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] (Deprecated 2019-01-31)    
Available-for-sale, Less than 12 continuous months, Fair value 20,579 15,290
Available-for-sale, Less than 12 continuous months, Unrealized loss (145) (54)
Available-for-sale, Greater than 12 continuous months, Fair value 659 52,804
Available-for-sale, Greater than 12 continuous months, Unrealized loss (1) (1,166)
Available-for-sale, Unrealized loss position, Fair value 21,238 68,094
Available-for-sale, Total securities in a loss position, Unrealized loss (146) (1,220)
Corporate bonds    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] (Deprecated 2019-01-31)    
Available-for-sale, Less than 12 continuous months, Fair value 500 0
Available-for-sale, Less than 12 continuous months, Unrealized loss (1) 0
Available-for-sale, Greater than 12 continuous months, Fair value 0 1,004
Available-for-sale, Greater than 12 continuous months, Unrealized loss 0 (14)
Available-for-sale, Unrealized loss position, Fair value 500 1,004
Available-for-sale, Total securities in a loss position, Unrealized loss $ (1) $ (14)