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Investment Securities (Tables)
9 Months Ended
Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract]  
Unrealized Gain (Loss) on Investments [Table Text Block]

The following tables present information related to the Company’s investment securities at September 30, 2016 and December 31, 2015 (dollars in thousands):

Gross Gross
Amortized Unrealized Unrealized Fair
September 30, 2016 Cost Gains Losses Value
Investment securities available-for-sale                  
       Federal agency obligations $ 55,024 $ 1,084 $ (9 ) $ 56,099
       Residential mortgage pass-through securities 62,124 1,292 (12 ) 63,404
       Commercial mortgage pass-through securities 4,218 151 - 4,369
       Obligations of U.S. states and political subdivisions 135,781 5,582 (2 ) 141,361
       Trust preferred securities 5,574 310 (209 ) 5,675
       Corporate bonds and notes 37,725 916 (348 ) 38,293
       Asset-backed securities 15,797 1 (296 ) 15,502
       Certificates of deposit 973 15 - 988
       Equity securities 376 52 (3 ) 425
       Other securities 12,332 94 (83 ) 12,343
              Total securities available-for-sale $ 329,924 $ 9,497 $ (962 ) $ 338,459
 
Gross Gross
Amortized Unrealized Unrealized Fair
December 31, 2015 Cost Gains Losses Value
Investment securities available-for-sale
       Federal agency obligations $ 29,062 $ 142 $ (58 ) $ 29,146
       Residential mortgage pass-through securities 44,155 803 (48 )   44,910
       Commercial mortgage pass-through securities 2,981   - (9 ) 2,972
       Obligations of U.S. states and political subdivisions 8,188 169 -   8,357
       Trust preferred securities 16,088 398 (231 ) 16,255
       Corporate bonds and notes 53,566 702   (292 ) 53,976
       Asset-backed securities   20,005 18 (298 ) 19,725
       Certificates of deposit 1,895 18   (8 ) 1,905
       Equity securities 376 21 (23 ) 374
       Other securities 18,303   - (153 ) 18,150
              Total securities available-for-sale $         194,619 $         2,271 $         (1,120 ) $         195,770
 
Gross Gross
Amortized Unrecognized Unrecognized Fair
Cost Gains Losses Value
Investment securities held-to-maturity
       U.S. Treasury and agency securities $ 28,471 $ 755 $ - $ 29,226
       Federal agency obligations 33,616 280 (119 ) 33,777
       Residential mortgage-backed securities 3,805 11 (6 ) 3,810
       Commercial mortgage-backed securities 4,110 27 (2 ) 4,135
       Obligations of U.S. states and political divisions 118,015 5,001 (3 ) 123,013
       Corporate bonds and notes 36,039 719 (161 ) 36,597
              Total securities held-to-maturity $ 224,056 $ 6,793 $ (291 ) $ 230,558
                         
       Total investment securities $ 418,675 $ 9,064 $ (1,411 ) $ 426,328
Investments Classified by Contractual Maturity Date [Table Text Block]

The following table presents information for investment securities at September 30, 2016, based on scheduled maturities. Actual maturities can be expected to differ from scheduled maturities due to prepayment or early call options of the issuer.

September 30, 2016
Amortized       Fair
Cost Value
(in thousands)
Investment securities available-for-sale:
       Due in one year or less $ 3,886   $ 3,906
       Due after one year through five years 26,238 26,914
       Due after five years through ten years 55,486 57,204
       Due after ten years 165,264   169,894
Residential mortgage pass-through securities   62,124 63,404
Commercial mortgage pass-through securities 4,218 4,369
Equity securities 376 425
Other securities 12,332 12,343
       Total $      329,924 $      338,459
Schedule of Realized Gain (Loss) [Table Text Block]

Gross gains and losses from the sales, calls and maturities of investment securities for the three-month and nine-month periods ended September 30, 2016 and 2015 were as follows:

Three Months Ended Nine Months Ended
September 30, September 30,
(in thousands)       2016       2015       2016       2015
Proceeds   $ 78,680 $ 32,125 $ 85,253 $ 44,397
Gross gains on sales of investment securities 4,131   2,067 4,234   2,793
Gross losses on sales of investment securities   -   -   -   -
       Net gains on sales of investment securities 4,131 2,067 4,234 2,793
       Less: tax provision on net gains 1,640 794 1,682 1,091
 
              Total $ 2,491 $ 1,273 $ 2,552 $ 1,702
Schedule of Unrealized Loss on Investments [Table Text Block]

The following tables indicate gross unrealized losses not recognized in income and fair value, aggregated by investment category and the length of time individual securities have been in a continuous unrealized loss position at September 30, 2016 and December 31, 2015:

September 30, 2016
Total Less than 12 Months 12 Months or Longer
Fair Unrealized Fair Unrealized Fair Unrealized
Value       Losses       Value       Losses       Value       Losses
(in thousands)
Investment securities
       available-for-sale:
 
Federal agency obligation $ 2,685 $ (9 ) $ 1,366 $ (3 ) $ 1,319 $ (6 )
Residential mortgage  
       pass-through securities 2,978 (12 ) 2,596 (9 ) 382 (3 )
Obligations of U.S. states        
       and political subdivisions 575 (2 ) 575   (2 )
Trust preferred securities 1,369 (209 ) - -   1,369   (209 )
Corporate bonds and notes 13,945   (348 ) 5,741   (185 ) 8,204 (163 )
Asset-backed securities 14,025 (296 ) 3,891 (72 ) 10,134   (224 )
Equity securities 134 (3 )   - -   134 (3 )
Other securities 5,417 (83 ) - -   5,417 (83 )
       Total temporarily impaired
              securities $         41,128 $         (962 ) $         14,169 $         (271 ) $         26,959 $          (691 )

December 31, 2015
Total Less than 12 Months 12 Months or Longer
Fair Unrealized Fair Unrealized Fair   Unrealized
Value       Losses       Value       Losses       Value       Losses
(dollars in thousands)
Investment Securities
       Available-for-Sale:
 
Federal agency obligation $ 12,260 $ (58 ) $ 12,013 $ (54 ) $ 247 $ (4 )
Residential mortgage
       pass-through securities 9,027 (48 ) 9,027 (48 ) - -
Commercial mortgage-backed
       securities 2,971 (9 ) 2,971 (9 ) - -
Trust preferred securities 1,345 (231 ) - - 1,345 (231 )
Corporate bonds and notes 16,533 (292 ) 12,702 (161 ) 3,831 (131 )
Asset-backed securities 14,745 (298 ) 11,250 (188 ) 3,495 (110 )
Certificates of deposit 215 (8 ) 215 (8 ) - -
Equity securities 123 (23 ) - - 123 (23 )
Other securities 5,347 (153 ) - - 5,347 (153 )
Total $         62,566 $         (1,120 ) $         48,178 $         (468 ) $         14,388 $         (652 )
 
Investment Securities
       Held-to-Maturity:
 
Federal agency obligation 12,554 (119 )   11,783 (109 ) 771 (10 )
Residential mortgage
       pass-through securities 2,480   (6 ) 2,480 (6 ) - -
Commercial mortgage-backed                
       securities 1,331 (2 ) 1,331   (2 ) -   -  
Obligations of U.S. states      
       and political subdivisions 981   (3 ) 981 (3 ) - -
Corporate bonds and notes 5,536 (161 ) 5,536 (161 ) - -
Total $ 22,882 $ (291 ) $ 22,111 $ (281 ) $ 771 $ (10 )
 
Total Temporarily Impaired
       Securities $ 85,448 $ (1,411 ) $ 70,289 $ (749 ) $ 15,159 $ (662 )