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Investment Securities (Tables)
12 Months Ended
Dec. 31, 2013
Investment Securities [Abstract]  
Amortized cost and fair value of the securities available for sale
The amortized cost and fair value of the securities available for sale are as follows:
 
(dollars in thousands)
 
December 31, 2013
 
 
 
  
Gross
  
Gross
  
 
 
 
Amortized
  
Unrealized
  
Unrealized
  
Fair
 
 
 
Cost
  
Gains
  
Losses
  
Value
 
 
 
  
  
  
 
 
 
  
  
  
 
U.S. government sponsored enterprises
 
$
200,531
   
22
   
1,724
   
198,829
 
State and political subdivisions
  
7,623
   
135
   
-
   
7,758
 
Mortgage backed securities and collateralized mortgage obligations - residential
  
552,230
   
267
   
20,048
   
532,449
 
Corporate bonds
  
10,429
   
43
   
1
   
10,471
 
Small Business Administration-guaranteed participation securities
  
111,383
   
-
   
8,354
   
103,029
 
Mortgage backed securities and collateralized mortgage obligations - commercial
  
10,965
   
-
   
407
   
10,558
 
Other
  
650
   
-
   
-
   
650
 
Total debt securities
  
893,811
   
467
   
30,534
   
863,744
 
Equity securities
  
10
   
-
   
-
   
10
 
Total securities available for sale
 
$
893,821
   
467
   
30,534
   
863,754
 

 
 
December 31, 2012
 
 
 
  
Gross
  
Gross
  
 
 
 
Amortized
  
Unrealized
  
Unrealized
  
Fair
 
 
 
Cost
  
Gains
  
Losses
  
Value
 
 
 
  
  
  
 
U.S. government sponsored enterprises
 
$
262,063
   
1,055
   
10
   
263,108
 
State and political subdivisions
  
25,815
   
642
   
-
   
26,457
 
Mortgage backed securities and collateralized mortgage obligations - residential
  
515,322
   
3,982
   
528
   
518,776
 
Corporate bonds
  
26,312
   
336
   
119
   
26,529
 
Small Business Administration-guaranteed participation securities
  
75,674
   
888
   
-
   
76,562
 
Other
  
650
   
-
   
-
   
650
 
Total debt securities
  
905,836
   
6,903
   
657
   
912,082
 
Equity securities
  
10
   
-
   
-
   
10
 
Total securities available for sale
 
$
905,846
   
6,903
   
657
   
912,092
 
Investment [Line Items]  
Proceeds from sales and calls of securities available for sale, gross realized gains and gross realized losses
The proceeds from sales and calls of securities available for sale, gross realized gains and gross realized losses from sales and calls during 2013, 2012 and 2011 are as follows:

(dollars in thousands)
 
Year ended December 31,
 
 
 
2013
  
2012
  
2011
 
 
 
  
  
 
Proceeds from sales
 
$
160,820
   
154,944
   
47,296
 
Proceeds from calls
  
256,384
   
1,049,306
   
1,124,649
 
Gross realized gains
  
1,702
   
2,584
   
1,472
 
Gross realized losses
  
80
   
423
   
44
 
Amortized cost and fair value of the held to maturity securities
The amortized cost and fair value of the held to maturity securities are as follows:

(dollars in thousands)
 
December 31, 2013
 
 
 
  
Gross
  
Gross
  
 
 
 
Amortized
  
Unrecognized
  
Unrecognized
  
Fair
 
 
 
Cost
  
Gains
  
Losses
  
Value
 
 
 
  
  
  
 
Mortgage backed securities and collateralized mortgage obligations - residential
 
$
76,270
   
2,744
   
138
   
78,876
 
Corporate bonds
  
9,945
   
1,484
   
-
   
11,429
 
Total held to maturity
 
$
86,215
   
4,228
   
138
   
90,305
 

 
 
December 31, 2012
 
 
 
  
Gross
  
Gross
  
 
 
 
Amortized
  
Unrecognized
  
Unrecognized
  
Fair
 
 
 
Cost
  
Gains
  
Losses
  
Value
 
 
 
  
  
  
 
Mortgage backed securities and collateralized mortgage obligations - residential
 
$
108,471
   
5,724
   
-
   
114,195
 
Corporate bonds
  
34,955
   
1,976
   
-
   
36,931
 
Total held to maturity
 
$
143,426
   
7,700
   
-
   
151,126
 
Securities held in available for sale and held to maturity greater than 10% of shareholders equity
The Company has the following balances of securities held in the available for sale and held to maturity portfolios as of December 31, 2013 that represent greater than 10% of shareholders equity:

 
 
Amortized
  
Fair
 
 
 
Cost
  
Value
 
Small Business Administration
 
$
111,383
   
103,029
 
Federal Home Loan Mortgage Corporation
  
159,375
   
154,492
 
Government National Mortgage Association
  
100,578
   
101,947
 
Federal National Mortgage Association
  
538,260
   
523,070
 
Securities available for sale [Member]
 
Investment [Line Items]  
Debt securities based on the securities final maturity
The following table distributes the debt securities included in the available for sale portfolio as of December 31, 2013, based on the securities’ final maturity (mortgage-backed securities and collateralized mortgage obligations are stated using an estimated average life):
 
(dollars in thousands)
 
Amortized
  
Fair
 
 
 
Cost
  
Value
 
Due in one year or less
 
$
11,221
   
11,284
 
Due in one year through five years
  
359,564
   
355,727
 
Due after five years through ten years
  
520,721
   
494,395
 
Due after ten years
  
2,305
   
2,338
 
 
 
$
893,811
   
863,744
 
Gross unrealized losses on investment securities and the related fair values aggregated by the length of time that individual securities have been in an unrealized loss position
Gross unrealized losses on securities available for sale and the related fair values aggregated by the length of time that individual securities have been in an unrealized loss position, were as follows:

(dollars in thousands)
 
December 31, 2013
 
 
 
Less than
  
12 months
  
  
 
 
 
12 months
  
or more
  
Total
 
 
 
  
Gross
  
  
Gross
  
  
Gross
 
 
 
Fair
  
Unreal.
  
Fair
  
Unreal.
  
Fair
  
Unreal.
 
 
 
Value
  
Loss
  
Value
  
Loss
  
Value
  
Loss
 
 
 
  
  
  
  
  
 
U.S. government sponsored enterprises
 
$
198,023
   
1,724
   
-
   
-
   
198,023
   
1,724
 
Mortgage backed securities and collateralized mortgage obligations - residential
  
466,056
   
17,698
   
54,835
   
2,350
   
520,891
   
20,048
 
Corporate bonds
  
902
   
1
   
-
   
-
   
902
   
1
 
Small Business Administration-guaranteed participation securities
  
103,029
   
8,354
   
-
   
-
   
103,029
   
8,354
 
Mortgage backed securities and collateralized mortgage obligations - commercial
  
10,558
   
407
   
-
   
-
   
10,558
   
407
 
Total
 
$
778,568
   
28,184
   
54,835
   
2,350
   
833,403
   
30,534
 

 
 
December 31, 2012
 
 
 
Less than
  
12 months
  
  
 
 
 
12 months
  
or more
  
Total
 
 
 
  
Gross
  
  
Gross
  
  
Gross
 
 
 
Fair
  
Unreal.
  
Fair
  
Unreal.
  
Fair
  
Unreal.
 
 
 
Value
  
Loss
  
Value
  
Loss
  
Value
  
Loss
 
U.S. government sponsored enterprises
 
$
15,491
   
10
   
-
   
-
   
15,491
   
10
 
Mortgage backed securities and collateralized mortgage obligations - residential
  
178,689
   
528
   
-
   
-
   
178,689
   
528
 
Corporate bonds
  
10,283
   
119
   
-
   
-
   
10,283
   
119
 
Total
 
$
204,463
   
657
   
-
   
-
   
204,463
   
657
 
Held to maturity securities [Member]
 
Investment [Line Items]  
Debt securities based on the securities final maturity
The following table distributes the debt securities included in the held to maturity portfolio as of December 31, 2013, based on the securities’ final maturity (mortgage-backed securities and collateralized mortgage obligations are stated using an estimated average life):

(dollars in thousands)
 
Amortized
  
Fair
 
 
 
Cost
  
Value
 
Due in one year or less
 
$
-
   
-
 
Due in one year through five years
  
86,215
   
90,305
 
Due in five years through ten years
  
-
   
-
 
 
 
$
86,215
   
90,305
 
Gross unrealized losses on investment securities and the related fair values aggregated by the length of time that individual securities have been in an unrealized loss position
Gross unrecognized losses on held to maturity securities and the related fair values aggregated by the length of time that individual securities have been in an unrealized loss position at December 31, 2013, were as follows:

(dollars in thousands)
 
December 31, 2013
 
 
 
Less than
  
12 months
  
  
 
 
 
12 months
  
or more
  
Total
 
 
 
  
Gross
  
  
Gross
  
  
Gross
 
 
 
Fair
  
Unrec.
  
Fair
  
Unrec.
  
Fair
  
Unrec.
 
 
 
Value
  
Loss
  
Value
  
Loss
  
Value
  
Loss
 
 
 
  
  
  
  
  
 
Mortgage backed securities and collateralized mortgage obligations - residential
 
$
27,091
   
138
   
-
   
-
   
27,091
   
138
 
Total
 
$
27,091
   
138
   
-
   
-
   
27,091
   
138