Loans and Allowance for Credit Losses - Schedule of Contractual Maturities of Loans (Detail) (USD $) In Thousands, unless otherwise specified
|
Dec. 31, 2013
|
Financing Receivable, Allowance for Credit Losses [Line Items] |
|
Loans receivable gross of acquired loan discount and fair value |
$ 7,906,303 |
Loans with a predetermined interest rate |
3,451,196 |
Loans with a floating interest rate |
4,455,107 |
Total |
7,906,303 |
Commercial and Industrial [Member]
|
|
Financing Receivable, Allowance for Credit Losses [Line Items] |
|
Loans receivable gross of acquired loan discount and fair value |
1,313,108 |
Construction, land development and other land loans [Member]
|
|
Financing Receivable, Allowance for Credit Losses [Line Items] |
|
Loans receivable gross of acquired loan discount and fair value |
874,758 |
1-4 Family residential (includes home equity) [Member]
|
|
Financing Receivable, Allowance for Credit Losses [Line Items] |
|
Loans receivable gross of acquired loan discount and fair value |
2,141,379 |
Commercial (includes multi-family residential) [Member]
|
|
Financing Receivable, Allowance for Credit Losses [Line Items] |
|
Loans receivable gross of acquired loan discount and fair value |
2,822,661 |
Agriculture (includes farmland) [Member]
|
|
Financing Receivable, Allowance for Credit Losses [Line Items] |
|
Loans receivable gross of acquired loan discount and fair value |
539,269 |
Consumer and other [Member]
|
|
Financing Receivable, Allowance for Credit Losses [Line Items] |
|
Loans receivable gross of acquired loan discount and fair value |
215,128 |
One Year Or Less [Member]
|
|
Financing Receivable, Allowance for Credit Losses [Line Items] |
|
Loans receivable gross of acquired loan discount and fair value |
1,171,082 |
Loans with a predetermined interest rate |
373,155 |
Loans with a floating interest rate |
797,927 |
Total |
1,171,082 |
One Year Or Less [Member] | Commercial and Industrial [Member]
|
|
Financing Receivable, Allowance for Credit Losses [Line Items] |
|
Loans receivable gross of acquired loan discount and fair value |
505,151 |
One Year Or Less [Member] | Construction, land development and other land loans [Member]
|
|
Financing Receivable, Allowance for Credit Losses [Line Items] |
|
Loans receivable gross of acquired loan discount and fair value |
280,838 |
One Year Or Less [Member] | 1-4 Family residential (includes home equity) [Member]
|
|
Financing Receivable, Allowance for Credit Losses [Line Items] |
|
Loans receivable gross of acquired loan discount and fair value |
30,352 |
One Year Or Less [Member] | Commercial (includes multi-family residential) [Member]
|
|
Financing Receivable, Allowance for Credit Losses [Line Items] |
|
Loans receivable gross of acquired loan discount and fair value |
113,892 |
One Year Or Less [Member] | Agriculture (includes farmland) [Member]
|
|
Financing Receivable, Allowance for Credit Losses [Line Items] |
|
Loans receivable gross of acquired loan discount and fair value |
172,535 |
One Year Or Less [Member] | Consumer and other [Member]
|
|
Financing Receivable, Allowance for Credit Losses [Line Items] |
|
Loans receivable gross of acquired loan discount and fair value |
68,314 |
After One Through Five Years [Member]
|
|
Financing Receivable, Allowance for Credit Losses [Line Items] |
|
Loans receivable gross of acquired loan discount and fair value |
1,445,943 |
Loans with a predetermined interest rate |
721,115 |
Loans with a floating interest rate |
724,828 |
Total |
1,445,943 |
After One Through Five Years [Member] | Commercial and Industrial [Member]
|
|
Financing Receivable, Allowance for Credit Losses [Line Items] |
|
Loans receivable gross of acquired loan discount and fair value |
472,113 |
After One Through Five Years [Member] | Construction, land development and other land loans [Member]
|
|
Financing Receivable, Allowance for Credit Losses [Line Items] |
|
Loans receivable gross of acquired loan discount and fair value |
172,245 |
After One Through Five Years [Member] | 1-4 Family residential (includes home equity) [Member]
|
|
Financing Receivable, Allowance for Credit Losses [Line Items] |
|
Loans receivable gross of acquired loan discount and fair value |
134,488 |
After One Through Five Years [Member] | Commercial (includes multi-family residential) [Member]
|
|
Financing Receivable, Allowance for Credit Losses [Line Items] |
|
Loans receivable gross of acquired loan discount and fair value |
498,971 |
After One Through Five Years [Member] | Agriculture (includes farmland) [Member]
|
|
Financing Receivable, Allowance for Credit Losses [Line Items] |
|
Loans receivable gross of acquired loan discount and fair value |
72,384 |
After One Through Five Years [Member] | Consumer and other [Member]
|
|
Financing Receivable, Allowance for Credit Losses [Line Items] |
|
Loans receivable gross of acquired loan discount and fair value |
95,742 |
After Five Years [Member]
|
|
Financing Receivable, Allowance for Credit Losses [Line Items] |
|
Loans receivable gross of acquired loan discount and fair value |
5,289,278 |
Loans with a predetermined interest rate |
2,356,926 |
Loans with a floating interest rate |
2,932,352 |
Total |
5,289,278 |
After Five Years [Member] | Commercial and Industrial [Member]
|
|
Financing Receivable, Allowance for Credit Losses [Line Items] |
|
Loans receivable gross of acquired loan discount and fair value |
335,844 |
After Five Years [Member] | Construction, land development and other land loans [Member]
|
|
Financing Receivable, Allowance for Credit Losses [Line Items] |
|
Loans receivable gross of acquired loan discount and fair value |
421,675 |
After Five Years [Member] | 1-4 Family residential (includes home equity) [Member]
|
|
Financing Receivable, Allowance for Credit Losses [Line Items] |
|
Loans receivable gross of acquired loan discount and fair value |
1,976,539 |
After Five Years [Member] | Commercial (includes multi-family residential) [Member]
|
|
Financing Receivable, Allowance for Credit Losses [Line Items] |
|
Loans receivable gross of acquired loan discount and fair value |
2,209,798 |
After Five Years [Member] | Agriculture (includes farmland) [Member]
|
|
Financing Receivable, Allowance for Credit Losses [Line Items] |
|
Loans receivable gross of acquired loan discount and fair value |
294,350 |
After Five Years [Member] | Consumer and other [Member]
|
|
Financing Receivable, Allowance for Credit Losses [Line Items] |
|
Loans receivable gross of acquired loan discount and fair value |
$ 51,072 |