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Securities - Maturity of Securities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Amortized Cost And Fair Value Debt Securities [Abstract] |  |
Amortized cost, Within one year | $ 3,640 | $ 4,180
Amortized cost, After one year but within five years | 7,277 | 10,360
Amortized cost, After five years but within ten years | 837 | 1,400
Amortized cost, After ten years | 232 | 476
Amortized cost, Total | 11,986 | 16,416
Amortized Cost, Within one year | 208,625 | 144,666
Amortized Cost, After one year but within five years | 167,554 | 256,890
Amortized Cost, After five years but within ten years | 27,195 | 36,764
Amortized Cost, After ten years | 97,542 | 90,626
Total debt securities | 500,916 | 528,946
Amortized Cost, Equity securities | 8,715 | 7,463
Amortized Cost, Total | 509,631 | 536,409
Estimated Fair Value, Within one year | 3,649 | 4,227
Estimated Fair Value, After one year but within five years | 7,321 | 10,496
Estimated Fair Value, After five years but within ten years | 865 | 1,438
Estimated Fair Value, After ten years | 259 | 528
Estimated Fair Value | 12,094 | 16,689
Estimated Fair Value, Within one year | 209,065 | 145,027
Estimated Fair Value, After one year but within five years | 168,210 | 259,475
Estimated Fair Value, After five years but within ten years | 27,797 | 38,306
Estimated Fair Value, After ten years | 98,551 | 93,293
Total debt securities | 503,623 | 536,101
Estimated Fair Value, Equity securities | 12,018 | 10,025
Estimated Fair Value, Total | $ 515,641 | $ 546,126

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- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant