Fair Value Measurements - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Financial Liabilities:
Accrued Interest Payable Fair Value Disclosure	$ 31,374	$ 15,961
Equity investments without readily determinable fair values	26,400
Reported Value Measurement [Member]
Financial Assets:
FHLB stock	25,461	29,776
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Estimate of Fair Value
Financial Assets:
Cash and cash equivalents	459,606	492,000
Financial Liabilities:
Convertible Debt, Fair Value Disclosures	180,525
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Reported Value Measurement [Member]
Financial Assets:
Cash and cash equivalents	459,606	492,000
Financial Liabilities:
Convertible Debt, Fair Value Disclosures	194,543
Significant Other Observable Inputs (Level 2) \| Estimate of Fair Value
Financial Assets:
Loans held for sale	25,943	32,048
Customers' liabilities on acceptances	2,281	1,691
Financial Liabilities:
Noninterest-bearing deposits	3,022,633	2,998,734
Saving and other interest bearing demand deposits	3,262,399	3,573,212
Time deposits	5,889,030	4,263,585
FHLB advances	810,812	1,220,529
Federal Funds Purchased, Fair Value Disclosure		69,900
Accrued Interest Payable Fair Value Disclosure	31,374	15,961
Subordinated debentures	116,542	100,853
Bank's liabilities on acceptances outstanding	2,281	1,691
Equity investments without readily determinable fair values	26,430
Significant Other Observable Inputs (Level 2) \| Reported Value Measurement [Member]
Financial Assets:
Loans held for sale	25,128	29,661
Customers' liabilities on acceptances	2,281	1,691
Financial Liabilities:
Noninterest-bearing deposits	3,022,633	2,998,734
Saving and other interest bearing demand deposits	3,262,399	3,573,212
Time deposits	5,870,624	4,274,663
FHLB advances	821,280	1,157,693
Federal Funds Purchased, Fair Value Disclosure		69,900
Subordinated debentures	101,929	100,853
Bank's liabilities on acceptances outstanding	2,281	1,691
Equity investments without readily determinable fair values	26,430
Significant Unobservable Inputs (Level 3) \| Estimate of Fair Value
Financial Assets:
Loans receivable - net	11,913,906	11,112,179
Servicing Assets, Fair Value Disclosure	24,762	27,511
Significant Unobservable Inputs (Level 3) \| Reported Value Measurement [Member]
Financial Assets:
Loans receivable - net	12,005,558	11,018,034
Servicing Assets, Fair Value Disclosure	23,132	24,710
Fair Value Inputs, Level 2 And Level 3 [Member] \| Estimate of Fair Value
Financial Assets:
Other Investments, Fair Value Disclosure	29,374	52,960
Accrued Interest Receivable Fair Value Disclosure	32,225	29,979
Fair Value Inputs, Level 2 And Level 3 [Member] \| Reported Value Measurement [Member]
Financial Assets:
Other Investments, Fair Value Disclosure	29,409	53,366
Accrued Interest Receivable Fair Value Disclosure	$ 32,225	$ 29,979
Cash and Cash Equivalents [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Estimate of Fair Value
Financial Liabilities:
Fair Value Measurements, Valuation Techniques	Level 1	Level 1
Other Investments [Member] \| Fair Value Inputs, Level 2 And Level 3 [Member] \| Estimate of Fair Value
Financial Liabilities:
Fair Value Measurements, Valuation Techniques	Level 2/3	Level 2/3
Loans held for sale, net \| Significant Other Observable Inputs (Level 2) \| Estimate of Fair Value
Financial Liabilities:
Fair Value Measurements, Valuation Techniques	Level 2	Level 2
Loans Receivable [Member] \| Significant Unobservable Inputs (Level 3) \| Estimate of Fair Value
Financial Liabilities:
Fair Value Measurements, Valuation Techniques	Level 3	Level 3
Accrued interest receivable [Member] \| Fair Value Inputs, Level 2 And Level 3 [Member] \| Estimate of Fair Value
Financial Liabilities:
Fair Value Measurements, Valuation Techniques	Level 2/3	Level 2/3
Servicing Assets [Member] \| Significant Unobservable Inputs (Level 3) \| Estimate of Fair Value
Financial Liabilities:
Fair Value Measurements, Valuation Techniques	Level 3	Level 3
Customers' liabilities on acceptances [Member] \| Significant Other Observable Inputs (Level 2) \| Estimate of Fair Value
Financial Liabilities:
Fair Value Measurements, Valuation Techniques	Level 2	Level 2
Noninterest Bearing Deposits \| Significant Other Observable Inputs (Level 2) \| Estimate of Fair Value
Financial Liabilities:
Fair Value Measurements, Valuation Techniques	Level 2	Level 2
Saving and other interest bearing demand deposits [Member] \| Significant Other Observable Inputs (Level 2) \| Estimate of Fair Value
Financial Liabilities:
Fair Value Measurements, Valuation Techniques	Level 2	Level 2
Bank Time Deposits [Member] \| Significant Other Observable Inputs (Level 2) \| Estimate of Fair Value
Financial Liabilities:
Fair Value Measurements, Valuation Techniques	Level 2	Level 2
Federal Home Loan Bank Borrowings [Member] \| Significant Other Observable Inputs (Level 2) \| Estimate of Fair Value
Financial Liabilities:
Fair Value Measurements, Valuation Techniques	Level 2	Level 2
Convertible Notes Payable [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Estimate of Fair Value
Financial Liabilities:
Fair Value Measurements, Valuation Techniques	Level 1
Federal Funds Purchased [Member] \| Significant Other Observable Inputs (Level 2) \| Estimate of Fair Value
Financial Liabilities:
Fair Value Measurements, Valuation Techniques		Level 2
Subordinated Debt Obligations [Member] \| Significant Other Observable Inputs (Level 2) \| Estimate of Fair Value
Financial Liabilities:
Fair Value Measurements, Valuation Techniques	Level 2	Level 2
Accrued interest payable [Member] \| Significant Other Observable Inputs (Level 2) \| Estimate of Fair Value
Financial Liabilities:
Fair Value Measurements, Valuation Techniques	Level 2	Level 2
Bank's liabilities on acceptances outstanding [Member] \| Significant Other Observable Inputs (Level 2) \| Estimate of Fair Value
Financial Liabilities:
Fair Value Measurements, Valuation Techniques	Level 2	Level 2

Accrued Interest Payable Fair Value Disclosure

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Bank Acceptances Executed and Outstanding Fair Value Disclosure

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Due From Customer Acceptances Fair Value Disclosure

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Equity Securities Without Readily Determinable Fair Value, Amount

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Non Interest Bearing Deposits, Fair Value Disclosure

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Servicing Assets, Fair Value Disclosure

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Time Deposits Fair Value Disclosure

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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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 (b)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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Fair value portion of short term borrowing where a bank borrows, at the federal funds rate, from another bank.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Fair value portion of borrowing from Federal Home Loan Bank (FHLBank).

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Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2196772

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