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Securities (Tables)
6 Months Ended
Jun. 30, 2018
Investments debt and equity securities [Abstract]  
Available-for-sale Securities [Table Text Block]
1 year1 to 55 to 10After 10FairGross Unrealized Amortized
(Dollars in thousands)or lessyearsyearsyearsValueGainsLossesCost
June 30, 2018
Agency obligations (a)$4,47424,48222,40551,3611,672$53,033
Agency RMBS (a)9,617119,389129,006804,337133,263
State and political subdivisions3,4068,33859,20970,95375475470,953
Total available-for-sale$4,47427,88840,360178,598251,3208346,763$257,249

December 31, 2017
Agency obligations (a)$29,25323,80953,06279904$53,887
Agency RMBS (a)11,201121,871133,0723301,639134,381
State and political subdivisions2,5649,99959,00071,5631,61623770,184
Total available-for-sale$31,81745,009180,871257,6972,0252,780$258,452
(a) Includes securities issued by U.S. government agencies or government sponsored entities.
Available-for-sale Securities, Continuous Unrealized Loss Position [Table Text Block]
Less than 12 Months12 Months or LongerTotal
FairUnrealizedFairUnrealizedFairUnrealized
(Dollars in thousands)ValueLossesValueLossesValueLosses
June 30, 2018:
Agency obligations $31,52343719,8381,235$51,3611,672
Agency RMBS55,4151,36065,6082,977121,0234,337
State and political subdivisions14,8793029,86745224,746754
Total $101,8172,09995,3134,664$197,1306,763

December 31, 2017:
Agency obligations $14,3819920,353805$34,734904
Agency RMBS53,44036350,7291,276104,1691,639
State and political subdivisions2,0092210,15521512,164237
Total $69,83048481,2372,296$151,0672,780
Schedule of Realized Gain (Loss) [Table Text Block]
Realized Gains and Losses
The following table presents the gross realized gains and losses on sales of securities.
Quarter ended June 30,Six Months ended June 30,
(Dollars in thousands)2018201720182017
Gross realized gains$$2
Realized gains, net$$2