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Investment Securities - Unrealized Loss Positions (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months $ 343 $ 3,078
Greater than or equal to 12 continuous months 37,919 127,053
Total Securities in a loss position 38,262 130,131
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (3) (12)
Greater than or equal to 12 continuous months (356) (3,510)
Held-to-maturity, Gross Unrealized Losses (359) (3,522)
Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 8,290 81,533
Available-for-sale, greater than 12 continuous months, Fair value 56,645 234,850
Available-for-sale, Total Securities in a loss position, Fair Value 64,935 316,383
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (4) (657)
Available-for-sale, greater than 12 continuous months, Unrealized loss (286) (4,537)
Available-for-sale, Total Securities in a loss position, Unrealized loss (290) (5,194)
Marketable Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Marketable securities, less than 12 continuous months, Fair value 8,633 84,611
Marketable securities, greater than 12 continuous months, Fair value 94,564 361,903
Marketable securities, Total Securities in a loss position, Fair value 103,197 446,514
Marketable Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Marketable securities, less than 12 continuous months, Unrealized loss (7) (669)
Marketable securities, greater than 12 continuous months, Unrealized loss (642) (8,047)
Marketable securities, Total Securities in a loss position, Unrealized loss (649) (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 343 198
Greater than or equal to 12 continuous months 34,714 83,990
Total Securities in a loss position 35,057 84,188
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (3) (9)
Greater than or equal to 12 continuous months (336) (2,800)
Held-to-maturity, Gross Unrealized Losses (339) (2,809)
Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 0 19,971
Available-for-sale, greater than 12 continuous months, Fair value 13,537 50,077
Available-for-sale, Total Securities in a loss position, Fair Value 13,537 70,048
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss 0 (128)
Available-for-sale, greater than 12 continuous months, Unrealized loss (50) (1,102)
Available-for-sale, Total Securities in a loss position, Unrealized loss (50) (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 3,113 20,123
Available-for-sale, Total Securities in a loss position, Fair Value 3,113 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 (56) (284)
Available-for-sale, Total Securities in a loss position, Unrealized loss (56) (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 3,877 16,138
Available-for-sale, Total Securities in a loss position, Fair Value 3,877 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 (9) (322)
Available-for-sale, Total Securities in a loss position, Unrealized loss (9) (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 3,205 28,171
Total Securities in a loss position 3,205 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 (20) (567)
Held-to-maturity, Gross Unrealized Losses (20) (570)
Debt Securities, Available-For-Sale, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 8,153 24,094
Available-for-sale, greater than 12 continuous months, Fair value 17,767 74,243
Available-for-sale, Total Securities in a loss position, Fair Value 25,920 98,337
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (2) (330)
Available-for-sale, greater than 12 continuous months, Unrealized loss (55) (1,267)
Available-for-sale, Total Securities in a loss position, Unrealized loss (57) (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 56 1,666
Available-for-sale, greater than 12 continuous months, Fair value 7,948 9,112
Available-for-sale, Total Securities in a loss position, Fair Value 8,004 10,778
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (1) (7)
Available-for-sale, greater than 12 continuous months, Unrealized loss (39) (267)
Available-for-sale, Total Securities in a loss position, Unrealized loss (40) (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 0 4,992
Available-for-sale, greater than 12 continuous months, Fair value 0 11,349
Available-for-sale, Total Securities in a loss position, Fair Value 0 16,341
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 (115)
Available-for-sale, Total Securities in a loss position, Unrealized loss 0 (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 81  
Available-for-sale, greater than 12 continuous months, Fair value 0  
Available-for-sale, Total Securities in a loss position, Fair Value 81  
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 0 15,290
Available-for-sale, greater than 12 continuous months, Fair value 9,395 52,804
Available-for-sale, Total Securities in a loss position, Fair Value 9,395 68,094
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss 0 (54)
Available-for-sale, greater than 12 continuous months, Unrealized loss (76) (1,166)
Available-for-sale, Total Securities in a loss position, Unrealized loss (76) (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 1,008 1,004
Available-for-sale, Total Securities in a loss position, Fair Value 1,008 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)