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Securities Available for Sale and Held to Maturity (Tables)
 9 Months Ended
Sep. 30, 2015
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 tables are a summary of the amortized cost and estimated fair value of securities available for sale and held to maturity at September 30, 2015 and December 31, 2014 ($ in thousands):

 
Securities Available for Sale  
Securities Held to Maturity 
 
September 30, 2015
 
Amortized
Cost
  
Gross
Unrealized
Gains
  
Gross
Unrealized
(Losses)
  
Estimated
Fair
Value
  
Amortized
Cost
  
Gross
Unrealized
Gains
  
Gross
Unrealized
(Losses)
  
Estimated
Fair
Value
 
U.S. Government agency obligations
                
Issued by U.S. Government agencies
 
$
70,993
  
$
716
  
$
(427
)
 
$
71,282
  
$
-
  
$
-
  
$
-
  
$
-
 
Issued by U.S. Government sponsored agencies
  
22,774
   
242
   
-
   
23,016
   
101,578
   
4,380
   
-
   
105,958
 
Obligations of states and political subdivisions
  
142,968
   
4,839
   
(13
)
  
147,794
   
56,661
   
3,242
   
-
   
59,903
 
Mortgage-backed securities
                                
Residential mortgage pass-through securities
                                
Guaranteed by GNMA
  
26,269
   
486
   
(104
)
  
26,651
   
17,783
   
435
   
(19
)
  
18,199
 
Issued by FNMA and FHLMC
  
172,710
   
4,722
   
(21
)
  
177,411
   
10,669
   
457
   
-
   
11,126
 
Other residential mortgage-backed securities
                                
Issued or guaranteed by FNMA, FHLMC or GNMA
  
1,611,762
   
23,413
   
(4,773
)
  
1,630,402
   
808,763
   
12,196
   
(315
)
  
820,644
 
Commercial mortgage-backed securities
                                
Issued or guaranteed by FNMA, FHLMC or GNMA
  
272,779
   
6,920
   
(90
)
  
279,609
   
182,986
   
4,316
   
(64
)
  
187,238
 
Asset-backed securities and structured financial products
  
26,295
   
362
   
-
   
26,657
   
-
   
-
   
-
   
-
 
Total
 
$
2,346,550
  
$
41,700
  
$
(5,428
)
 
$
2,382,822
  
$
1,178,440
  
$
25,026
  
$
(398
)
 
$
1,203,068
 
                                 
December 31, 2014
                                
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
 
Securities with gross unrealized losses, segregated by length of impairment
The tables below include securities with gross unrealized losses segregated by length of impairment at September 30, 2015 and December 31, 2014 ($ in thousands):

  
Less than 12 Months
  
12 Months or More
  
Total
 
September 30, 2015
 
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
 
$
9,150
  
$
(18
)
 
$
32,228
  
$
(409
)
 
$
41,378
  
$
(427
)
Obligations of states and political subdivisions
  
1,275
   
(4
)
  
2,860
   
(9
)
  
4,135
   
(13
)
Mortgage-backed securities
                        
Residential mortgage pass-through securities
                        
Guaranteed by GNMA
  
19,671
   
(123
)
  
-
   
-
   
19,671
   
(123
)
Issued by FNMA and FHLMC
  
2,485
   
(21
)
  
-
   
-
   
2,485
   
(21
)
Other residential mortgage-backed securities
                        
Issued or guaranteed by FNMA, FHLMC or GNMA
  
161,853
   
(544
)
  
248,585
   
(4,544
)
  
410,438
   
(5,088
)
Commercial mortgage-backed securities
                        
Issued or guaranteed by FNMA, FHLMC or GNMA
  
11,847
   
(90
)
  
11,182
   
(64
)
  
23,029
   
(154
)
Total
 
$
206,281
  
$
(800
)
 
$
294,855
  
$
(5,026
)
 
$
501,136
  
$
(5,826
)
                         
December 31, 2014
                        
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
)
Gains and losses as a result of calls and disposition of securities
Gains and losses as a result of calls and dispositions of securities, as well as any associated proceeds, were as follows for the periods presented ($ in thousands):

   
Three Months Ended September 30,
  
Nine Months Ended September 30,
 
Available for Sale
  
2015
  
2014
  
2015
  
2014
 
Proceeds from calls and sales of securities
 
$
-
  
$
30,540
  
$
-
  
$
56,815
 
Gross realized gains
   
-
   
67
   
-
   
456
 
Gross realized (losses)
   
-
   
(156
)
  
-
   
(156
)
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 September 30, 2015, 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
Available for Sale
  
Securities
Held to Maturity
 
  
Amortized
Cost
  
Estimated
Fair Value
  
Amortized
Cost
  
Estimated
Fair Value
 
Due in one year or less
 
$
17,392
  
$
17,525
  
$
825
  
$
835
 
Due after one year through five years
  
148,869
   
154,170
   
9,597
   
9,954
 
Due after five years through ten years
  
23,380
   
23,794
   
135,959
   
142,132
 
Due after ten years
  
73,389
   
73,260
   
11,858
   
12,940
 
   
263,030
   
268,749
   
158,239
   
165,861
 
Mortgage-backed securities
  
2,083,520
   
2,114,073
   
1,020,201
   
1,037,207
 
Total
 
$
2,346,550
  
$
2,382,822
  
$
1,178,440
  
$
1,203,068