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Investment Securities - Unrealized Loss Positions (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months $ 6,396 $ 3,078
Greater than or equal to 12 continuous months 103,910 127,053
Total Securities in a loss position 110,306 130,131
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (52) (12)
Greater than or equal to 12 continuous months (1,839) (3,510)
Held-to-maturity, Gross Unrealized Losses (1,891) (3,522)
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 21,013 81,533
Available-for-sale, greater than 12 continuous months, Fair value 218,008 234,850
Available-for-sale, Total Securities in a loss position, Fair Value 239,021 316,383
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (134) (657)
Available-for-sale, greater than 12 continuous months, Unrealized loss (2,639) (4,537)
Available-for-sale, Total Securities in a loss position, Unrealized loss (2,773) (5,194)
Marketable Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Marketable securities, less than 12 continuous months, Fair value 27,409 84,611
Marketable securities, greater than 12 continuous months, Fair value 321,918 361,903
Marketable securities, Total Securities in a loss position, Fair value 349,327 446,514
Marketable Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Marketable securities, less than 12 continuous months, Unrealized loss (186) (669)
Marketable securities, greater than 12 continuous months, Unrealized loss (4,478) (8,047)
Marketable securities, Total Securities in a loss position, Unrealized loss (4,664) (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 2,663 198
Greater than or equal to 12 continuous months 70,078 83,990
Total Securities in a loss position 72,741 84,188
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (39) (9)
Greater than or equal to 12 continuous months (1,534) (2,800)
Held-to-maturity, Gross Unrealized Losses (1,573) (2,809)
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 0 19,971
Available-for-sale, greater than 12 continuous months, Fair value 51,734 50,077
Available-for-sale, Total Securities in a loss position, Fair Value 51,734 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 (560) (1,102)
Available-for-sale, Total Securities in a loss position, Unrealized loss (560) (1,230)
SBA-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 12,253 13,175
Available-for-sale, greater than 12 continuous months, Fair value 14,799 20,123
Available-for-sale, Total Securities in a loss position, Fair Value 27,052 33,298
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (123) (122)
Available-for-sale, greater than 12 continuous months, Unrealized loss (102) (284)
Available-for-sale, Total Securities in a loss position, Unrealized loss (225) (406)
CMOs issued by FNMA    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months 0 0
Greater than or equal to 12 continuous months 11,165 11,327
Total Securities in a loss position 11,165 11,327
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months 0 0
Greater than or equal to 12 continuous months (1) (120)
Held-to-maturity, Gross Unrealized Losses (1) (120)
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 0 2,345
Available-for-sale, greater than 12 continuous months, Fair value 17,786 16,138
Available-for-sale, Total Securities in a loss position, Fair Value 17,786 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 (282) (322)
Available-for-sale, Total Securities in a loss position, Unrealized loss (282) (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 19,113 28,171
Total Securities in a loss position 19,113 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 (292) (567)
Held-to-maturity, Gross Unrealized Losses (292) (570)
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 4,187 24,094
Available-for-sale, greater than 12 continuous months, Fair value 72,861 74,243
Available-for-sale, Total Securities in a loss position, Fair Value 77,048 98,337
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (3) (330)
Available-for-sale, greater than 12 continuous months, Unrealized loss (789) (1,267)
Available-for-sale, Total Securities in a loss position, Unrealized loss (792) (1,597)
CMOs issued by GNMA    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months 3,733  
Greater than or equal to 12 continuous months 0  
Total Securities in a loss position 3,733  
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (13)  
Greater than or equal to 12 continuous months 0  
Held-to-maturity, Gross Unrealized Losses (13)  
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 3,529 1,666
Available-for-sale, greater than 12 continuous months, Fair value 10,127 9,112
Available-for-sale, Total Securities in a loss position, Fair Value 13,656 10,778
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (4) (7)
Available-for-sale, greater than 12 continuous months, Unrealized loss (298) (267)
Available-for-sale, Total Securities in a loss position, Unrealized loss (302) (274)
Debentures of government- sponsored agencies    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 0 4,992
Available-for-sale, greater than 12 continuous months, Fair value 11,385 11,349
Available-for-sale, Total Securities in a loss position, Fair Value 11,385 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 (83) (115)
Available-for-sale, Total Securities in a loss position, Unrealized loss (83) (123)
Obligations of state and political subdivisions    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months 0 0
Greater than or equal to 12 continuous months 3,554 3,565
Total Securities in a loss position 3,554 3,565
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months 0 0
Greater than or equal to 12 continuous months (12) (23)
Held-to-maturity, Gross Unrealized Losses (12) (23)
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 1,044 15,290
Available-for-sale, greater than 12 continuous months, Fair value 38,308 52,804
Available-for-sale, Total Securities in a loss position, Fair Value 39,352 68,094
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (4) (54)
Available-for-sale, greater than 12 continuous months, Unrealized loss (520) (1,166)
Available-for-sale, Total Securities in a loss position, Unrealized loss (524) (1,220)
Corporate bonds    
Debt Securities, Available-for-sale, Unrealized Loss Position [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 (5) (14)
Available-for-sale, Total Securities in a loss position, Unrealized loss $ (5) $ (14)