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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2013
Investments, Debt and Equity Securities [Abstract]  
Schedule of amortized cost, gross unrealized gains and losses, and fair value of investment securities
The amortized cost, gross unrealized gains and losses, and fair value of the Company’s investment securities as of September 30, 2013 and December 31, 2012 were as follows:

(dollars in thousands)
Amortized Cost

 
Gross
Unrealized Gains

 
Gross
Unrealized Losses

 
Fair Value

September 30, 2013
 

 
 

 
 

 
 

Available-for-Sale:
 

 
 

 
 

 
 

Debt Securities Issued by the U.S. Treasury and Government Agencies
$
449,001

 
$
7,011

 
$
(191
)
 
$
455,821

Debt Securities Issued by States and Political Subdivisions
589,108

 
9,469

 
(11,338
)
 
587,239

Debt Securities Issued by Corporations
280,305

 
1,347

 
(6,396
)
 
275,256

Mortgage-Backed Securities:
 

 
 

 
 

 
 

    Residential - Government Agencies
702,921

 
15,571

 
(1,018
)
 
717,474

    Residential - U.S. Government-Sponsored Enterprises
23,829

 
1,434

 
—

 
25,263

    Commercial - Government Agencies
224,711

 
—

 
(8,628
)
 
216,083

Total Mortgage-Backed Securities
951,461

 
17,005

 
(9,646
)
 
958,820

Total
$
2,269,875

 
$
34,832

 
$
(27,571
)
 
$
2,277,136

Held-to-Maturity:
 

 
 

 
 

 
 

Debt Securities Issued by the U.S. Treasury and Government Agencies
$
414,558

 
$
4,082

 
$
(1,947
)
 
$
416,693

Debt Securities Issued by States and Political Subdivisions
253,893

 
2,556

 
(22
)
 
256,427

Debt Securities Issued by Corporations
194,094

 
177

 
(3,731
)
 
190,540

Mortgage-Backed Securities:
 
 
 
 
 
 
 

    Residential - Government Agencies
3,422,851

 
41,365

 
(53,289
)
 
3,410,927

    Residential - U.S. Government-Sponsored Enterprises
23,375

 
1,450

 
—

 
24,825

    Commercial - Government Agencies
324,628

 
239

 
(2,788
)
 
322,079

Total Mortgage-Backed Securities
3,770,854

 
43,054


(56,077
)

3,757,831

Total
$
4,633,399

 
$
49,869

 
$
(61,777
)
 
$
4,621,491

 
 
 
 
 
 
 
 
December 31, 2012
 

 
 

 
 

 
 

Available-for-Sale:
 

 
 

 
 

 
 

Debt Securities Issued by the U.S. Treasury and Government Agencies
$
855,070

 
$
14,936

 
$
(17
)
 
$
869,989

Debt Securities Issued by States and Political Subdivisions
753,207

 
30,159

 
(955
)
 
782,411

Debt Securities Issued by Corporations
82,450

 
1,984

 
—

 
84,434

Mortgage-Backed Securities:
 
 
 
 
 
 
 

    Residential - Government Agencies
1,041,669

 
27,283

 
(292
)
 
1,068,660

    Residential - U.S. Government-Sponsored Enterprises
35,234

 
2,064

 
—

 
37,298

    Commercial - Government Agencies
524,055

 
1,907

 
(1,197
)
 
524,765

Total Mortgage-Backed Securities
1,600,958

 
31,254

 
(1,489
)
 
1,630,723

Total
$
3,291,685

 
$
78,333

 
$
(2,461
)
 
$
3,367,557

Held-to-Maturity:
 

 
 

 
 

 
 

Debt Securities Issued by the U.S. Treasury and Government Agencies
$
190,168

 
$
5,198

 
$
—

 
$
195,366

Debt Securities Issued by Corporations
24,000

 
4

 
—

 
24,004

Mortgage-Backed Securities:
 
 
 
 
 
 
 

    Residential - Government Agencies
3,349,403

 
86,673

 
(1,366
)
 
3,434,710

    Residential - U.S. Government-Sponsored Enterprises
31,494

 
2,102

 
—

 
33,596

Total Mortgage-Backed Securities
3,380,897

 
88,775

 
(1,366
)
 
3,468,306

Total
$
3,595,065

 
$
93,977

 
$
(1,366
)
 
$
3,687,676
Analysis of the contractual maturities of investment securities
The table below presents an analysis of the contractual maturities of the Company’s investment securities as of September 30, 2013.  Mortgage-backed securities are disclosed separately in the table below as these investment securities may prepay prior to their scheduled contractual maturity dates.
(dollars in thousands)
Amortized Cost

 
Fair Value

Available-for-Sale:
 

 
 

Due in One Year or Less
$
74,862

 
$
75,212

Due After One Year Through Five Years
254,924

 
259,762

Due After Five Years Through Ten Years
644,469

 
635,390

Due After Ten Years
344,159

 
347,952

 
1,318,414

 
1,318,316

Mortgage-Backed Securities:
 

 
 

    Residential - Government Agencies
702,921

 
717,474

    Residential - U.S. Government-Sponsored Enterprises
23,829

 
25,263

    Commercial - Government Agencies
224,711

 
216,083

Total Mortgage-Backed Securities
951,461

 
958,820

Total
$
2,269,875

 
$
2,277,136

 
 
 
 
Held-to-Maturity:
 

 
 

Due in One Year or Less
$
80,251

 
$
80,591

Due After One Year Through Five Years
334,307

 
336,102

Due After Five Years Through Ten Years
99,806

 
100,778

Due After Ten Years
348,181

 
346,189

 
862,545

 
863,660

Mortgage-Backed Securities:
 

 
 

    Residential - Government Agencies
3,422,851

 
3,410,927

    Residential - U.S. Government-Sponsored Enterprises
23,375

 
24,825

    Commercial - Government Agencies
324,628

 
322,079

Total Mortgage-Backed Securities
3,770,854

 
3,757,831

Total
$
4,633,399

 
$
4,621,491
Schedule of investment securities in an unrealized loss position
The Company’s investment securities in an unrealized loss position, segregated by continuous length of impairment, were as follows:
 
Less Than 12 Months
 
12 Months or Longer
 
Total
(dollars in thousands)
Fair Value

 
Gross Unrealized Losses

 
Fair Value

 
Gross Unrealized Losses

 
Fair Value

 
Gross Unrealized Losses

September 30, 2013
 

 
 

 
 

 
 

 
 

 
 

Available-for-Sale:
 
 
 
 
 
 
 
 
 
 
 
Debt Securities Issued by the U.S. Treasury
   and Government Agencies
$
18,693

 
$
(181
)
 
$
2,149

 
$
(10
)
 
$
20,842

 
$
(191
)
Debt Securities Issued by States
   and Political Subdivisions
340,491

 
(11,337
)
 
114

 
(1
)
 
340,605

 
(11,338
)
Debt Securities Issued by Corporations
201,817

 
(6,396
)
 
—

 
—

 
201,817

 
(6,396
)
Mortgage-Backed Securities:
 
 
 
 
 
 
 
 


 


    Residential - Government Agencies
54,834

 
(382
)
 
9,417

 
(636
)
 
64,251

 
(1,018
)
    Commercial - Government Agencies
216,083

 
(8,628
)
 
—

 
—

 
216,083

 
(8,628
)
Total Mortgage-Backed Securities
270,917

 
(9,010
)
 
9,417

 
(636
)
 
280,334

 
(9,646
)
Total
$
831,918

 
$
(26,924
)
 
$
11,680

 
$
(647
)
 
$
843,598

 
$
(27,571
)
Held-to-Maturity:
 
 
 
 
 
 
 
 
 
 
 
Debt Securities Issued by the U.S. Treasury
   and Government Agencies
$
183,850

 
$
(1,947
)
 
$
—

 
$
—

 
$
183,850

 
$
(1,947
)
Debt Securities Issued by States
   and Political Subdivisions
8,105

 
(22
)
 
—

 
—

 
8,105

 
(22
)
Debt Securities Issued by Corporations
151,775

 
(3,731
)
 
—

 
—

 
151,775

 
(3,731
)
Mortgage-Backed Securities:
 
 
 
 
 
 
 
 
 
 
 
    Residential - Government Agencies
1,577,637

 
(53,289
)
 
—

 
—

 
1,577,637

 
(53,289
)
    Commercial - Government Agencies
239,960

 
(2,498
)
 
19,891

 
(290
)
 
259,851

 
(2,788
)
Total Mortgage-Backed Securities
1,817,597

 
(55,787
)
 
19,891

 
(290
)
 
1,837,488

 
(56,077
)
Total
$
2,161,327

 
$
(61,487
)
 
$
19,891

 
$
(290
)
 
$
2,181,218

 
$
(61,777
)
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2012
 

 
 

 
 

 
 

 
 

 
 

Available-for-Sale:
 
 
 
 
 
 
 
 
 
 
 
Debt Securities Issued by the U.S. Treasury
     and Government Agencies
$
2,295

 
$
(14
)
 
$
564

 
$
(3
)
 
$
2,859

 
$
(17
)
Debt Securities Issued by States
     and Political Subdivisions
72,400

 
(955
)
 
—

 
—

 
72,400

 
(955
)
Mortgage-Backed Securities:
 
 
 
 
 
 
 
 
 
 
 
     Residential - Government Agencies
7,325

 
(57
)
 
22,389

 
(235
)
 
29,714

 
(292
)
     Commercial - Government Agencies
261,883

 
(1,197
)
 
—

 
—

 
261,883

 
(1,197
)
Total Mortgage-Backed Securities
269,208

 
(1,254
)
 
22,389

 
(235
)
 
291,597

 
(1,489
)
Total
$
343,903

 
$
(2,223
)
 
$
22,953

 
$
(238
)
 
$
366,856

 
$
(2,461
)
Held-to-Maturity:
 
 
 
 
 
 
 
 
 
 
 
Mortgage-Backed Securities:
 
 
 
 
 
 
 
 
 
 
 
     Residential - Government Agencies
$
351,762

 
$
(1,366
)
 
$
—

 
$
—

 
$
351,762

 
$
(1,366
)
Total
$
351,762

 
$
(1,366
)
 
$
—

 
$
—

 
$
351,762

 
$
(1,366
)
Schedule of carrying value of company's federal home loan bank and federal reserve bank
As of September 30, 2013, the carrying value of the Company’s Federal Home Loan Bank and Federal Reserve Bank stock was as follows:
(dollars in thousands)
September 30,
2013

 
December 31,
2012

Federal Home Loan Bank Stock
$
58,564

 
$
60,200

Federal Reserve Bank Stock
19,055

 
18,952

Total
$
77,619

 
$
79,152