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Securities Available for Sale - Amortized Cost and Estimated Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost - Due within one year	$ 751
Amortized Cost - Due after one year through five years	17,565
Amortized Cost - Due after five years through ten years	27,873
Amortized Cost - Due after ten years	35,979
Amortized Cost	1,893,618	$ 1,751,879
Estimated Fair Value - Due within one year	761
Estimated Fair Value - Due after one year through five years	17,669
Estimated Fair Value - Due after five years through ten years	27,901
Estimated Fair Value - Due after ten years	33,081
Estimated Fair Value	1,846,265	1,720,257
Carrying values of securities pledged as collateral	354,600	359,200
Collateralized Mortgage Obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	914,710
Amortized Cost	914,710	856,193
Estimated Fair Value	895,122
Estimated Fair Value	895,122	838,709
Mortgage-backed Securities, Residential
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	415,659
Amortized Cost	415,659	477,676
Estimated Fair Value	402,605
Estimated Fair Value	402,605	471,214
Mortgage-backed Securities, Commercial
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	481,081
Amortized Cost	481,081	308,046
Estimated Fair Value	469,126
Estimated Fair Value	469,126	301,365
Mutual funds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		22,425
Estimated Fair Value		21,957
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,000	4,997
Estimated Fair Value	$ 3,826	$ 4,475

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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