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Investment Securities (Tables)
6 Months Ended
Jun. 30, 2014
Investments, Debt and Equity Securities [Abstract]  
Unrealized Gain (Loss) on Investments [Table Text Block] The following tables present information related to the Corporation’s investment securities at June 30, 2014 and December 31, 2013.

    June 30, 2014  
    Amortized
Cost
    Gross
Unrealized
Gains
    Gross
Unrealized
Losses
    Fair Value  
    (dollars in thousands)  
Investment Securities Available-for-Sale:                                
U.S. Treasury and agency securities   $ 9,608     $     $ (136 )   $ 9,472  
Federal agency obligations     22,643       116       (111 )     22,648  
Residential mortgage pass-through securities     44,369       1,563       (13 )     45,919  
Commercial mortgage pass-through securities     3,072             (51 )     3,021  
Obligations of U.S. states and political subdivisions     6,303       200             6,503  
Trust preferred securities     16,085       490       (239 )     16,336  
Corporate bonds and notes     132,401       6,969       (43 )     139,327  
Asset-backed securities     15,010       166             15,176  
Certificates of deposit     2,099       38       (5 )     2,132  
Equity securities     376             (83 )     293  
Mutual funds and money market funds     6,232             (100 )     6,132  
Total   $ 258,198     $ 9,542     $ (781 )   $ 266,959  
                                 
Investment Securities Held-to-Maturity:                                
U.S. Treasury and agency securities   $ 28,159     $ 257     $     $ 28,416  
Federal agency obligations     22,039       166       (19 )     22,186  
Residential mortgage pass-through securities     2,049       14             2,063  
Commercial mortgage pass-through securities     4,341       77       (18 )     4,400  
Obligations of U.S. states and political subdivisions     123,646       3,327       (410 )     126,563  
Corporate bonds and notes     37,925       950             38,875  
Total   $ 218,159     $ 4,791     $ (447 )   $ 222,503  
Total investment securities   $ 476,357     $ 14,333     $ (1,228 )   $ 489,462  
    December 31, 2013  
    Amortized
Cost
    Gross
Unrealized
Gains
    Gross
Unrealized
Losses
    Fair Value  
    (dollars in thousands)  
Investment Securities Available-for-Sale:                                
U.S. Treasury and agency securities   $ 14,344     $     $ (825 )   $ 13,519  
Federal agency obligations     20,567       29       (655 )     19,941  
Residential mortgage pass-through securities     48,312       791       (229 )     48,874  
Commercial mortgage pass-through securities     7,145       3       (157 )     6,991  
Obligations of U.S. states and political subdivisions     30,804       711       (55 )     31,460  
Trust preferred securities     19,763       150       (510 )     19,403  
Corporate bonds and notes     154,182       4,930       (482 )     158,630  
Asset-backed securities     15,733       246             15,979  
Certificates of deposit     2,250       32       (20 )     2,262  
Equity securities     376             (89 )     287  
Mutual funds and money market funds     5,671       68       (15 )     5,724  
Total   $ 319,147     $ 6,960     $ (3,037 )   $ 323,070  
Investment Securities Held-to-Maturity:                                
U.S. Treasury and agency securities   $ 28,056     $     $ (1,019 )   $ 27,037  
Federal agency obligations     15,249       23       (389 )     14,883  
Residential mortgage-backed securities     2,246             (64 )     2,182  
Commercial mortgage-backed securities     4,417       41       (62 )     4,396  
Obligations of U.S. states and political subdivisions     127,418       1,303       (3,688 )     125,033  
Corporate bonds and notes     37,900       149       (622 )     37,427  
Total   $ 215,286     $ 1,516     $ (5,844 )   $ 210,958  
Total investment securities   $ 534,433     $ 8,476     $ (8,881 )   $ 534,028  
Investments Classified by Contractual Maturity Date [Table Text Block] The following table presents information for investment securities available-for-sale at June 30, 2014, based on scheduled maturities. Actual maturities can be expected to differ from scheduled maturities due to prepayment or early call options of the issuer.

    June 30, 2014  
    Amortized
Cost
    Fair Value  
    (in thousands)  
Investment Securities Available-for-Sale:      
Due in one year or less   $ 9,384     $ 9,499  
Due after one year through five years     45,331       46,591  
Due after five years through ten years     112,083       117,869  
Due after ten years     37,351       37,635  
Residential mortgage pass-through securities     44,369       45,919  
Commercial mortgage pass-through securities     3,072       3,021  
Equity securities     376       293  
Mutual funds and money market funds     6,232       6,132  
Total   $ 258,198     $ 266,959  
Investment Securities Held-to-Maturity:                
Due in one year or less   $ 2,052     $ 2,054  
Due after one year through five years     12,932       13,203  
Due after five years through ten years     68,506       69,838  
Due after ten years     128,279       130,945  
Residential mortgage-backed securities     2,049       2,063  
Commercial mortgage pass-through securities     4,341       4,400  
Total   $ 218,159     $ 222,503  
                 
Total investment securities   $ 476,357     $ 489,462  
Schedule of Realized Gain (Loss) [Table Text Block] Gross gains and losses from the sales of investment securities for the three-month and six-month periods ended June 30, 2014 and 2013 were as follows:

    Three Months Ended
June 30,
    Six Months Ended
June 30,
 
(in thousands)   2014     2013     2014     2013  
Gross gains on sales of investment securities   $ 579     $ 600     $ 2,011     $ 1,032  
Gross losses on sales of investment securities     5             22       89  
Net gains on sales of investment securities   $ 574     $ 600     $ 1,989     $ 943  
Schedule of OTTI Charges for period The following summarizes OTTI charges for the periods indicated.

    Three Months Ended     Six Months Ended  
    June 30,     June 30,  
(in thousands)   2014     2013     2014     2013  
Other than temporary impairment charges   $     $     $     $  
Principal losses on a variable rate CMO                       24  
Total other-than-temporary impairment charges   $     $     $     $ 24  
Schedule Of Preferred Security And Associated Ratings [Table Text Block] The following table presents detailed information for each trust preferred security held by the Corporation at June 30, 2014 which has at least one rating below investment grade.

Deal Name   Single
Issuer or
Pooled
  Class/
Tranche
    Amortized
Cost
    Fair
Value
    Gross
Unrealized
Gain (Loss)
    Lowest
Credit
Rating
Assigned
  Number of
Banks
Currently
Performing
    Deferrals
and Defaults
as % of
Original
Collateral
  Expected
Deferral/Defaults
as % of
Remaining
Performing
Collateral
    (dollars in thousands)
Countrywide Capital IV   Single     n/a     $ 1,771     $ 1,819     $ 48     BB+     1     None   None
Countrywide Capital V   Single     n/a       2,747       2,858       111     BB+     1     None   None
Countrywide Capital V   Single     n/a       250       260       10     BB+     1     None   None
Nationsbank Cap Trust III   Single     n/a       1,574       1,335       (239 )   BB+     1     None   None
Morgan Stanley Cap Trust IV   Single     n/a       2,500       2,515       15     BB+     1     None   None
Morgan Stanley Cap Trust IV   Single     n/a       1,743       1,759       16     BB+     1     None   None
Goldman Sachs   Single     n/a       1,000       1,139       139     BB+     1     None   None
Stifel Financial   Single     n/a       4,500       4,651       151     BBB-     1     None   None
Total               $ 16,085     $ 16,336     $ 251                      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block] Credit Loss Portion of OTTI Recognized in Earnings on Debt Securities

    Six Months
Ended
June 30,
2014
    Year
Ended
December 31,
2013
 
    (in thousands)  
Balance of credit-related OTTI at January 1,   $     $ 4,450  
Addition:                
Credit losses on investment securities for which other-than-temporary impairment was not previously recognized           652  
Reduction:                
Credit losses on investment securities sold during the period           (5,102 )
Balance of credit-related OTTI at period end   $     $  
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 June 30, 2014 and December 31, 2013:

    June 30, 2014  
    Total     Less than 12 Months     12 Months or Longer  
    Fair
Value
    Unrealized
Losses
    Fair
Value
    Unrealized
Losses
    Fair
Value
    Unrealized
Losses
 
    (in thousands)  
Investment Securities Available-for-Sale:                                                
U.S. Treasury and agency securities   $ 9,472     $ (136 )   $     $     $ 9,472     $ (136 )
Federal agency obligations     8,093       (111 )     3,949       (37 )     4,144       (74 )
Residential mortgage pass-through securities     3,698       (13 )     448       (1 )     3,250       (12 )
Commercial mortgage pass-through securities     3,021       (51 )                 3,021       (51 )
Trust preferred securities     1,335       (239 )                 1,335       (239 )
Corporate bonds and notes     7,410       (43 )     5,445       (25 )     1,965       (18 )
Certificates of deposit     217       (5 )     217       (5 )            
Equity securities     294       (83 )                 294       (83 )
Mutual funds and money market funds     5,401       (100 )     4,413       (89 )     988       (11 )
Total     38,941       (781 )     14,472       (157 )     24,469       (624 )
Investment Securities Held-to-Maturity:                                                
U.S. Treasury and agency securities   $     $     $     $     $     $  
Federal agency obligations     1,757       (19 )     1,757       (19 )            
Residential mortgage pass-through securities                                    
Commercial mortgage pass-through securities     1,409       (18 )                 1,409       (18 )
Obligations of U.S. states and political subdivisions     33,586       (410 )     13,955       (48 )     19,631       (362 )
Total     36,752       (447 )     15,712       (67 )     21,040       (380 )
Total Temporarily Impaired Securities   $ 75,693     $ (1,228 )   $ 30,184     $ (224 )   $ 45,509     $ (1,004 )
    December 31, 2013  
    Total     Less than 12 Months     12 Months or Longer  
    Fair
Value
    Unrealized
Losses
    Fair
Value
    Unrealized
Losses
    Fair
Value
    Unrealized
Losses
 
    (in thousands)  
Investment Securities Available-for-Sale:                                                
U.S. Treasury and agency securities   $ 13,519     $ (825 )   $ 13,519     $ (825 )   $     $  
Federal agency obligation     17,200       (655 )     17,200       (655 )            
Residential mortgage pass-through securities     18,293       (229 )     18,293       (229 )            
Commercial mortgage pass-through securities     2,924       (157 )     2,924       (157 )            
Obligations of U.S. states and political subdivisions     4,199       (55 )     4,199       (55 )            
Trust preferred securities     5,306       (510 )     4,031       (211 )     1,275       (299 )
Corporate bonds and notes     32,498       (482 )     30,533       (448 )     1,965       (34 )
Certificates of deposit     552       (20 )     552       (20 )            
Equity securities     287       (89 )                 287       (89 )
Mutual funds and money market funds     985       (15 )                 985       (15 )
Total     95,763       (3,037 )     91,251       (2,600 )     4,512       (437 )
Investment Securities Held-to-Maturity:                                                
U.S. Treasury and agency securities   $ 27,037     $ (1,019 )   $ 27,037     $ (1,019 )   $     $  
Federal agency obligation     13,492       (389 )     13,197       (388 )     295       (1 )
Residential mortgage pass-through securities     2,182       (64 )     2,182       (64 )            
Commercial mortgage pass-through securities     1,395       (62 )     1,395       (62 )            
Obligations of U.S. states and political subdivisions     66,034       (3,688 )     57,072       (2,957 )     8,962       (731 )
Corporate bonds and notes     27,210       (622 )     27,210       (622 )            
Total     137,350       (5,844 )     128,093       (5,112 )     9,257       (732 )
Total Temporarily Impaired Securities   $ 233,113     $ (8,881 )   $ 219,344     $ (7,712 )   $ 13,769     $ (1,169 )