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Investment Securities - Held to Maturity (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
security
Sep. 30, 2018
USD ($)
security
Schedule of Held-to-maturity Securities [Line Items]      
Held-To-Maturity Securities, at Amortized Cost $ 255,095 $ 283,476 $ 289,952
Held-To-Maturity Securities, at Fair Value 259,128 280,338 282,719
Gross Unrealized Gains 4,077 486 261
Gross Unrealized Losses 44 3,624 7,494
Maturities of Debt Securities, at Amortized Cost:      
Within One Year 25,665    
From 1 - 5 Years 148,403    
From 5 - 10 Years 79,378    
Over 10 Years 1,649    
Maturities of Debt Securities, at Fair Value:      
Within One Year 25,696    
From 1 - 5 Years 150,389    
From 5 - 10 Years 81,359    
Over 10 Years 1,684    
Securities in a Continuous Loss Position, at Fair Value:      
Less than 12 Months 3,845 65,402 142,319
12 Months or Longer 8,475 124,617 89,165
Total $ 12,320 $ 190,019 $ 231,484
Number of Securities in a Continuous Loss Position | security 38 458 582
Unrealized Losses on Securities in a Continuous Loss Position:      
Less than 12 Months $ 10 $ 618 $ 2,746
12 Months or Longer 34 3,006 4,748
Total 44 3,624 7,494
Equity Securities 1,996 1,774 1,916
State and Municipal Obligations      
Schedule of Held-to-maturity Securities [Line Items]      
Held-To-Maturity Securities, at Amortized Cost 215,661 235,782 239,367
Held-To-Maturity Securities, at Fair Value 219,296 233,359 233,557
Gross Unrealized Gains 3,669 486 261
Gross Unrealized Losses 34 2,909 6,071
Maturities of Debt Securities, at Amortized Cost:      
Within One Year 21,974    
From 1 - 5 Years 112,660    
From 5 - 10 Years 79,378    
Over 10 Years 1,649    
Maturities of Debt Securities, at Fair Value:      
Within One Year 22,007    
From 1 - 5 Years 114,246    
From 5 - 10 Years 81,359    
Over 10 Years 1,684    
Securities in a Continuous Loss Position, at Fair Value:      
Less than 12 Months 763 32,093 95,944
12 Months or Longer 6,764 110,947 86,378
Total $ 7,527 $ 143,040 $ 182,322
Number of Securities in a Continuous Loss Position | security 19 411 535
Unrealized Losses on Securities in a Continuous Loss Position:      
Less than 12 Months $ 1 $ 162 $ 1,443
12 Months or Longer 33 2,747 4,628
Total 34 2,909 6,071
Mortgage-Backed Securities - Residential      
Schedule of Held-to-maturity Securities [Line Items]      
Held-To-Maturity Securities, at Amortized Cost 39,434 47,694 50,585
Held-To-Maturity Securities, at Fair Value 39,832 46,979 49,162
Gross Unrealized Gains 408 0 0
Gross Unrealized Losses 10 715 1,423
Maturities of Debt Securities, at Amortized Cost:      
Within One Year 3,691    
From 1 - 5 Years 35,743    
From 5 - 10 Years 0    
Over 10 Years 0    
Maturities of Debt Securities, at Fair Value:      
Within One Year 3,689    
From 1 - 5 Years 36,143    
From 5 - 10 Years 0    
Over 10 Years 0    
Securities in a Continuous Loss Position, at Fair Value:      
Less than 12 Months 3,082 33,309 46,375
12 Months or Longer 1,711 13,670 2,787
Total $ 4,793 $ 46,979 $ 49,162
Number of Securities in a Continuous Loss Position | security 19 47 47
Unrealized Losses on Securities in a Continuous Loss Position:      
Less than 12 Months $ 9 $ 456 $ 1,303
12 Months or Longer 1 259 120
Total 10 715 1,423
Fair Value, Measurements, Recurring      
Unrealized Losses on Securities in a Continuous Loss Position:      
Equity Securities 1,996 1,774 1,916
Collateral Pledged      
Schedule of Held-to-maturity Securities [Line Items]      
Held-To-Maturity Securities, Pledged as Collateral 244,373 266,341 268,229
US Government Agencies Debt Securities | Mortgage-Backed Securities - Residential      
Schedule of Held-to-maturity Securities [Line Items]      
Held-To-Maturity Securities, at Amortized Cost 1,844 2,180 3,147
US Government Agencies Debt Securities | Fair Value, Measurements, Recurring | Mortgage-Backed Securities - Residential      
Schedule of Held-to-maturity Securities [Line Items]      
Held-To-Maturity Securities, at Fair Value 1,854 2,143 2,222
US Government-sponsored Enterprises Debt Securities | Mortgage-Backed Securities - Residential      
Schedule of Held-to-maturity Securities [Line Items]      
Held-To-Maturity Securities, at Amortized Cost 37,590 45,514 47,438
US Government-sponsored Enterprises Debt Securities | Fair Value, Measurements, Recurring | Mortgage-Backed Securities - Residential      
Schedule of Held-to-maturity Securities [Line Items]      
Held-To-Maturity Securities, at Fair Value $ 37,978 $ 44,836 $ 46,940