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Fair Value Measurements - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Level 1 | Carrying Amount
Financial Assets:
Cash and cash equivalents	$ 236,101	$ 298,389
Level 1 | Estimated Fair Value
Financial Assets:
Cash and cash equivalents	236,101	298,389
Level 2 | Carrying Amount
Financial Assets:
Loans held for sale	13,843	8,273
Customers' liabilities on acceptances	2,769	1,463
Financial Liabilities:
Noninterest-bearing deposits	1,695,040	1,694,427
Saving and other interest bearing demand deposits	2,133,340	2,170,748
Time deposits	2,639,031	2,475,801
FHLB advances	530,495	530,591
Subordinated debentures	42,371	42,327
Bank's liabilities on acceptances outstanding	2,769	1,463
Level 2 | Estimated Fair Value
Financial Assets:
Loans held for sale	14,535	8,669
Customers' liabilities on acceptances	2,769	1,463
Financial Liabilities:
Noninterest-bearing deposits	1,695,040	1,694,427
Saving and other interest bearing demand deposits	2,133,340	2,170,748
Time deposits	2,643,155	2,478,858
FHLB advances	535,782	532,137
Subordinated debentures	44,138	44,084
Bank's liabilities on acceptances outstanding	2,769	1,463
Level 3 | Carrying Amount
Financial Assets:
Loans receivable - net	6,295,079	6,171,933
Level 3 | Estimated Fair Value
Financial Assets:
Loans receivable - net	6,713,741	6,559,838
Other Investments [Member] | Level 2 | Carrying Amount
Financial Liabilities:
Investments, Fair Value Disclosure	49,365	47,895
Other Investments [Member] | Level 2 | Estimated Fair Value
Financial Liabilities:
Investments, Fair Value Disclosure	$ 49,461	$ 47,919

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash
-URI http://asc.fasb.org/extlink&oid=6506951

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6507016

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Fair value of subordinated debt obligations including, but not limited to, subordinated loan, subordinated bond, subordinated debenture or junior debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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Fair value portion of borrowing from Federal Home Loan Bank (FHLBank).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13(3)(a))
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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Trading Securities
-URI http://asc.fasb.org/extlink&oid=6526789

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 35
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Available-for-Sale Securities
-URI http://asc.fasb.org/extlink&oid=6505594

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 1
-Subparagraph a, f, g
-Article 7

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Glossary Loan
-URI http://asc.fasb.org/extlink&oid=6517073

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