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Investment Securities Investment Securities-Schedule of Unealized Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 1,082 $ 1,403
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 46,390 47,162
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 482 537
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 11,314 11,446
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 1,564 1,940
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 57,704 58,608
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 35 60
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 4,370 7,623
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss 35 60
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value 4,370 7,623
Securities Continuous Unrealized Loss Position, Less than 12 months 1,117 1,463
Securities Continuous Unrealized Loss Position, Less than 12 months, Fair Value 50,760 54,785
Securities Continuous Unrealized Loss Position, 12 months or Longer 482 537
Securities Continuous Unrealized Loss Position, 12 months or Longer, Fair Value 11,314 11,446
Unrealized Loss on Securities 1,599 2,000
Securities Continuous Unrealized Loss Position, Fair Value 62,074 66,231
Mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 888 1,171
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 33,916 34,716
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 40 41
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 1,756 1,942
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 928 1,212
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 35,672 36,658
US Government Agency Securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 87 92
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 7,484 7,482
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 87 92
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 7,484 7,482
Corporate Bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 107 140
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 4,990 4,964
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 107 140
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 4,990 4,964
Other investments    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss [1] 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value [1] 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss [1] 442 496
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value [1] 9,558 9,504
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [1] 442 496
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [1] 9,558 9,504
Mortgage-backed securities    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 35 60
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 4,370 7,623
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss 35 60
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value $ 4,370 $ 7,623
[1] (1) Primarily comprised of an investment in a CRA fund with 95% of its underlying investments consisting of government and agency-backed securities.