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Securities Available for Sale and Held to Maturity (Tables)
 12 Months Ended
Dec. 31, 2014
Securities Available for Sale and Held to Maturity [Abstract]  
Amortized cost and estimated fair value of available for sale and held to maturity securities
The following table is a summary of the amortized cost and estimated fair value of securities available for sale and held to maturity at December 31, 2014 and 2013 ($ in thousands):

  
Securities Available for Sale
  
Securities Held to Maturity
 
December 31, 2014
 
Amortized
Cost
  
Gross
Unrealized
Gains
  
Gross
Unrealized
(Losses)
  
Estimated
Fair
Value
  
Amortized
Cost
  
Gross
Unrealized
Gains
  
Gross
Unrealized
(Losses)
  
Estimated
Fair
Value
 
U.S. Treasury securities
 
$
100
  
$
-
  
$
-
  
$
100
  
$
-
  
$
-
  
$
-
  
$
-
 
U.S. Government agency obligations
                                
Issued by U.S. Government agencies
  
79,788
   
694
   
(826
)
  
79,656
   
-
   
-
   
-
   
-
 
Issued by U.S. Government sponsored agencies
  
32,725
   
170
   
(77
)
  
32,818
   
100,971
   
2,631
   
-
   
103,602
 
Obligations of states and political subdivisions
  
157,001
   
5,325
   
(68
)
  
162,258
   
63,505
   
3,398
   
-
   
66,903
 
Mortgage-backed securities
                                
Residential mortgage pass-through securities
                                
Guaranteed by GNMA
  
11,897
   
544
   
(14
)
  
12,427
   
19,115
   
466
   
(16
)
  
19,565
 
Issued by FNMA and FHLMC
  
199,599
   
4,842
   
-
   
204,441
   
11,437
   
471
   
-
   
11,908
 
Other residential mortgage-backed securities
                                
Issued or guaranteed by FNMA, FHLMC or GNMA
  
1,655,733
   
16,664
   
(10,564
)
  
1,661,833
   
834,176
   
6,440
   
(1,916
)
  
838,700
 
Commercial mortgage-backed securities
                                
Issued or guaranteed by FNMA, FHLMC or GNMA
  
184,394
   
4,968
   
(28
)
  
189,334
   
141,481
   
1,750
   
(1,063
)
  
142,168
 
Asset-backed securities and structured financial products
  
30,776
   
924
   
-
   
31,700
   
-
   
-
   
-
   
-
 
Total
 
$
2,352,013
  
$
34,131
  
$
(11,577
)
 
$
2,374,567
  
$
1,170,685
  
$
15,156
  
$
(2,995
)
 
$
1,182,846
 
                                 
December 31, 2013
                                
U.S. Treasury securities
 
$
501
  
$
1
  
$
-
  
$
502
  
$
-
  
$
-
  
$
-
  
$
-
 
U.S. Government agency obligations
                                
Issued by U.S. Government agencies
  
129,653
   
1,125
   
(1,485
)
  
129,293
   
-
   
-
   
-
   
-
 
Issued by U.S. Government sponsored agencies
  
40,681
   
19
   
(521
)
  
40,179
   
100,159
   
-
   
(1,580
)
  
98,579
 
Obligations of states and political subdivisions
  
165,810
   
6,243
   
(315
)
  
171,738
   
65,987
   
2,806
   
(281
)
  
68,512
 
Mortgage-backed securities
                                
Residential mortgage pass-through securities
                                
Guaranteed by GNMA
  
14,099
   
459
   
(84
)
  
14,474
   
9,433
   
142
   
(72
)
  
9,503
 
Issued by FNMA and FHLMC
  
239,880
   
3,147
   
(1,909
)
  
241,118
   
12,724
   
30
   
(162
)
  
12,592
 
Other residential mortgage-backed securities
                                
Issued or guaranteed by FNMA, FHLMC or GNMA
  
1,300,375
   
12,459
   
(22,093
)
  
1,290,741
   
837,393
   
-
   
(15,072
)
  
822,321
 
Commercial mortgage-backed securities
                                
Issued or guaranteed by FNMA, FHLMC or GNMA
  
235,317
   
7,278
   
(423
)
  
242,172
   
143,032
   
85
   
(3,791
)
  
139,326
 
Asset-backed securities and structured financial products
  
62,689
   
1,248
   
-
   
63,937
   
-
   
-
   
-
   
-
 
Total
 
$
2,189,005
  
$
31,979
  
$
(26,830
)
 
$
2,194,154
  
$
1,168,728
  
$
3,063
  
$
(20,958
)
 
$
1,150,833
 
Securities with gross unrealized losses, segregated by length of impairment
The table below includes securities with gross unrealized losses segregated by length of impairment at December 31, 2014 and 2013 ($ in thousands):

  
Less than 12 Months
  
12 Months or More
  
Total
 
December 31, 2014
 
Estimated
Fair Value
  
Gross
Unrealized
Losses
  
Estimated
Fair Value
  
Gross
Unrealized
Losses
  
Estimated
Fair Value
  
Gross
Unrealized
Losses
 
U.S. Government agency obligations
            
Issued by U.S. Government agencies
 
$
19,220
  
$
(115
)
 
$
32,656
  
$
(711
)
 
$
51,876
  
$
(826
)
Issued by U.S. Government sponsored agencies
  
9,948
   
(52
)
  
9,956
   
(25
)
  
19,904
   
(77
)
Obligations of states and political subdivisions
  
8,431
   
(22
)
  
3,800
   
(46
)
  
12,231
   
(68
)
Mortgage-backed securities
                        
Residential mortgage pass-through securities
                        
Guaranteed by GNMA
  
7,199
   
(22
)
  
647
   
(8
)
  
7,846
   
(30
)
Other residential mortgage-backed securities
                        
Issued or guaranteed by FNMA, FHLMC or GNMA
  
537,033
   
(2,449
)
  
395,342
   
(10,031
)
  
932,375
   
(12,480
)
Commercial mortgage-backed securities
                        
Issued or guaranteed by FNMA, FHLMC or GNMA
  
9,134
   
(3
)
  
79,829
   
(1,088
)
  
88,963
   
(1,091
)
Total
 
$
590,965
  
$
(2,663
)
 
$
522,230
  
$
(11,909
)
 
$
1,113,195
  
$
(14,572
)
                         
December 31, 2013
                        
U.S. Government agency obligations
                        
Issued by U.S. Government agencies
 
$
68,908
  
$
(1,485
)
 
$
-
  
$
-
  
$
68,908
  
$
(1,485
)
Issued by U.S. Government sponsored agencies
  
138,478
   
(2,101
)
  
-
   
-
   
138,478
   
(2,101
)
Obligations of states and political subdivisions
  
55,963
   
(586
)
  
796
   
(10
)
  
56,759
   
(596
)
Mortgage-backed securities
                        
Residential mortgage pass-through securities
                        
Guaranteed by GNMA
  
14,732
   
(155
)
  
161
   
(1
)
  
14,893
   
(156
)
Issued by FNMA and FHLMC
  
118,466
   
(2,071
)
  
-
   
-
   
118,466
   
(2,071
)
Other residential mortgage-backed securities
                        
Issued or guaranteed by FNMA, FHLMC or GNMA
  
1,534,381
   
(36,750
)
  
23,458
   
(415
)
  
1,557,839
   
(37,165
)
Commercial mortgage-backed securities
                        
Issued or guaranteed by FNMA, FHLMC or GNMA
  
177,412
   
(4,214
)
  
-
   
-
   
177,412
   
(4,214
)
Total
 
$
2,108,340
  
$
(47,362
)
 
$
24,415
  
$
(426
)
 
$
2,132,755
  
$
(47,788
)
Gains and losses as a result of calls and disposition of securities
For the periods presented, gains and losses as a result of calls and dispositions of securities, as well as any associated proceeds, were as follows ($ in thousands):

  
Years Ended December 31,   
 
Available for Sale
 
2014
  
2013
  
2012
 
Proceeds from calls and sales of securities
 
$
56,815
  
$
224,853
  
$
38,364
 
Gross realized gains
  
456
   
1,680
   
1,052
 
Gross realized losses
  
(156
)
  
(1,195
)
  
(2
)
             
Held to Maturity
            
Proceeds from calls of securities
 
$
-
  
$
-
  
$
335
 
Gross realized gains
  
-
   
-
   
9
 
Contractual maturities of available for sale and held to maturity securities
The amortized cost and estimated fair value of securities available for sale and held to maturity at December 31, 2014, by contractual maturity, are shown below ($ in thousands).  Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

  
Securities
  
Securities
 
  
Available for Sale
  
Held to Maturity
 
    
Estimated
    
Estimated
 
  
Amortized
  
Fair
  
Amortized
  
Fair
 
  
Cost
  
Value
  
Cost
  
Value
 
Due in one year or less
 
$
18,088
  
$
18,236
  
$
2,496
  
$
2,513
 
Due after one year through five years
  
137,976
   
142,016
   
11,693
   
12,298
 
Due after five years through ten years
  
61,738
   
63,811
   
137,991
   
142,604
 
Due after ten years
  
82,588
   
82,469
   
12,296
   
13,090
 
   
300,390
   
306,532
   
164,476
   
170,505
 
Mortgage-backed securities
  
2,051,623
   
2,068,035
   
1,006,209
   
1,012,341
 
Total
 
$
2,352,013
  
$
2,374,567
  
$
1,170,685
  
$
1,182,846