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Fair Value Accounting and Measurement (Carrying Amounts and Estimated Fair Values of Selected Financial Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Assets
Interest-earning deposits with banks	$ 24,132	$ 17,407
Debt Securities, Available-for-sale	3,746,142	3,167,448
Estimate of Fair Value Measurement [Member]
Assets
Cash and due from banks	223,541	260,180
Interest-earning deposits with banks	24,132	17,407
Debt Securities, Available-for-sale	3,746,172	3,167,448
FHLB stock	48,120	25,960
Loans held for sale	17,718	3,849
Loans	8,883,865	8,316,946
Interest rate contracts	19,144	7,033
Interest Rate Cash Flow Hedge Asset at Fair Value	14,727
Liabilities
Time Deposits	397,736	407,659
FHLB Advances	952,762	400,085
Repurchase agreements	64,437	61,094
Subordinated Debt Obligations, Fair Value Disclosure	35,491	34,897
Interest rate contracts	19,145	7,033
Reported Value Measurement [Member]
Assets
Cash and due from banks	223,541	260,180
Interest-earning deposits with banks	24,132	17,407
Debt Securities, Available-for-sale	3,746,142	3,167,448
FHLB stock	48,120	25,960
Loans held for sale	17,718	3,849
Loans	8,659,497	8,308,142
Interest rate contracts	19,144	7,033
Interest Rate Cash Flow Hedge Asset at Fair Value	14,727
Liabilities
Time Deposits	400,070	414,443
FHLB Advances	953,469	399,523
Repurchase agreements	64,437	61,094
Subordinated Debt Obligations, Fair Value Disclosure	35,277	35,462
Interest rate contracts	19,145	7,033
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]
Assets
Cash and due from banks	223,541	260,180
Interest-earning deposits with banks	24,132	17,407
Debt Securities, Available-for-sale	0	248
FHLB stock	0	0
Loans held for sale	0	0
Loans	0	0
Interest rate contracts	0	0
Interest Rate Cash Flow Hedge Asset at Fair Value	0
Liabilities
Time Deposits	0	0
FHLB Advances	0	0
Repurchase agreements	0	0
Subordinated Debt Obligations, Fair Value Disclosure	0	0
Interest rate contracts	0	0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]
Assets
Cash and due from banks	0	0
Interest-earning deposits with banks	0	0
Debt Securities, Available-for-sale	3,746,172	3,167,200
FHLB stock	48,120	25,960
Loans held for sale	17,718	3,849
Loans	0	0
Interest rate contracts	19,144	7,033
Interest Rate Cash Flow Hedge Asset at Fair Value	14,727
Liabilities
Time Deposits	397,736	407,659
FHLB Advances	952,762	400,085
Repurchase agreements	64,437	61,094
Subordinated Debt Obligations, Fair Value Disclosure	35,491	34,897
Interest rate contracts	19,145	7,033
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]
Assets
Cash and due from banks	0	0
Interest-earning deposits with banks	0	0
Debt Securities, Available-for-sale	0	0
FHLB stock	0	0
Loans held for sale	0	0
Loans	8,883,865	8,316,946
Interest rate contracts	0	0
Interest Rate Cash Flow Hedge Asset at Fair Value	0
Liabilities
Time Deposits	0	0
FHLB Advances	0	0
Repurchase agreements	0	0
Subordinated Debt Obligations, Fair Value Disclosure	0	0
Interest rate contracts	$ 0	$ 0

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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

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For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet.

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Fair value as of the balance sheet date of all interest rate derivative assets designated as cash flow hedging instruments.

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Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets.

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

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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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Fair value portion of securities that an entity sells and agrees to repurchase at a specified date for a specified price.

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